I bike commute almost everyday, I'm tired of people in the office asking "where's my helmet" then followed by a snide comment that it is dangerous and I should protect my brain.
Here are my reasoning for not wearing helmet:
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I need my noise-cancelling headphone. The loud sound of cars is giving me more brain damage.
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I've been cycling since I was 4, and I've never got hit by a car. I know road rules and not an aggressive cyclist when commuting.
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I wear helmet when cycling for exercise, mountain-biking, when I could be distracted by either maintaining my rpm or cycling on difficult terrain. I don't cycle that fast when commuting.
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Helmet-checking is victim blaming. Cars are predominantly at fault in car-cyclist crash, it is almost always car who is not paying attention, texting, had eyes going elsewhere, dozing off, going off lanes. You cannot doze off when on a bike. Cyclist had everything to lose in a crash and tend to ride conservatively, regardless of what you believe. The only exception to this rule is gig economy delivery driver who are always in a rush, and it is always the fault of delivery company to impose such ridiculous time rule that endanger their workers.
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The cycling lane is for everyone. Wearing helmet creates an image that cycling on shared public road as method of transportation is inherently dangerous, and as a result, especially in North America you only see young adults cycling to commute. People go into debt to maintain their car, just because they perceive cycling as inherently dangerous. Having only fit young adult cycle also gives an excuse for your local municipality for not upgrading the public cycling infrastructure and make it safer.
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Finally, it's not your business. It is considered rude to tell people they shouldn't smoke, drink alcohol, eat meat, eat ultraprocessed food. Everyone knows they are bad for you, but people still do it. Driving cars kill the planet, it is bad for every living being, but people don't get scolded everyday for car-commuting. Sure, after everything I mentioned, it is still safer to wear helmet, but it is rude to scold me on my bad habit.

Yes, people fall and eat shit, even with robust cycling infrastructure. Drunk cycling is a thing in Denmark, and beyond 12am a lot of people cycles in zigzags going home from bars. There are no rule against drunk cycling because it is way safer than drunk driving, and public sector workers are annoyed at drunks who take public transport. Every other week or so drunks will fall off into the canals etc., especially on this bridge https://en.wikipedia.org/wiki/Inderhavnsbroen that was built wrong, off the most famous bar street/harbor in Copenhagen, Nyhavn. The bridge was the biggest public infrastructure scandal in Denmark (they miscalculated the length, so the bridge doesn't connect and they have to add zigzags, which caused drunk people to crash and sometimes fell off bikes). These accidents are all taken with humor by most people, and Copenhagen is still amongst the safest city for cyclist.
Here's the thing, for commuting and transport most people cycle slowly. In Denmark the speed of traffic for cyclist is usually not more than 10 mph (because you have to accommodate the elderly, kids, people in cargo bikes delivering packages, parents carrying their kids in cargo bikes, etc.) and it is pretty hard to get seriously hurt cycling at 10 mph even if you crash into utility pole head on. Even amongst bike commuters in NA, a lot of people want to cycle fast "to get workout" done in the morning then take a shower at work - this is by far the least safe way of commuting because you are exerting at near physical limit and likely not paying attention to traffic.
It is clear to me that the true menace is not other cyclist or stationary objects, but cars, more importantly cars that are not used to cyclists. There are safety in numbers, a group of cyclists is more visible than individual cyclist zipping in and out parked cars on side of a street. The only way to get more people to cycle is to provide safe cycling infrastructure, and I'm only one person, so in my own way, to get my co-workers to advocate or at least strongly think about these things is to show up at work not wearing helmet and being belligerent.
10 mph! How can you stand to ride so slowly?
I like biking. It's just a pleasant physical activity. I cannot fathom being ok moving so slowly though. When I've been in a rare 10mph zone it feels just miserable trying to go so slow and it's so incredibly easy to exceed that speed without even trying.
Yes, that's the thing. People who cycle simply for transport don't sweat at all and don't bother doing any physical exertions. This is why the most common commuter bikes in Denmark are the 3 speed internal gear hub upright bike with coaster brakes. You chat and joke casually with your friends on a bike lane riding side by side just like how you would chat on a car. Everyone is doing the same thing and traveling at same slow speed. In comparison, all cyclists in NA are tryhards.
This is also why I'm quite confident and safe cyclist in NA. I know road rules, right of way, I take a whole lane when necessary (so cars behind me have no choice but to wait until the road is wider to pass me), I don't hide and cycle in sidewalks (which is proven to be more dangerous than being on the road), but I also don't zip across traffic and be unpredictable. The noise cancelling headphones also helps so I don't have to hear the occasional verbal insults hurled at me by angry carbrained Yankee.
If I rode 10mph my commute would be over two hours each way
Ok well honestly you've completely lost me now because I can't get over biking without physical exertion. I'm going to just disengage now. Happy cycling and stay safe!