I am coming into this with sincerity because it is something I truly believe in. As a disclaimer, this is to cover people who, get angry because of being poked or already mentally disturbed. I am not including people who're angry through other means such as alcoholic rages, that's a different thing on its own.
And I know people are so going to probably bring up mental issues to contrast and compare. Please, this is not for that. This is not up for debate.
The reason I believe people who have anger issues are disrespected the most is because, I've been in their shoes. Plenty of times. It's a very awfully lonely and jarring world to be in when you're one of these types. It always feels like the world is constantly kicking you while you're down, it's not a great feeling to live with all of the time. The world is kicking at you and you feel unheard.
The online world treats people with anger issues like they're side show entertainment. Like "oh ho! he's angry! quick everyone, lets see how angrier he can get and he can't do shit because we're miles away from him and we're all behind keyboards! huhuhuhuhuhuh!". Friends and Family feel alienated around you, feel like they gotta walk on eggshells all of the time when it comes to engaging with you.
Therapists, Doctors, Psychologists just want to drug you up because they feel you're a lost cause. Society doesn't take you seriously, because they like to make things your fault all of the time. How many situations can you recall where you got angry because someone was knowingly instigating something with you and did everything in their power to make things hell for you? It happens in school a lot. It happens at work a fair deal.
And if you retaliate, there's this weird sensation society has where, even if you are in the right to react the way you did (violence aside), then they just see you as a wild animal that needs to be kicked to the side and away from everyone. It is very fucking weird and it is a real thing.
People act all so surprised when the buttons are pushed too much and then we reach dangerous levels that do involve violence. I'm sorry but I sympathize a lot with people who end up having to resort to violence when all options to handle things as civilly and peacefully as possible has been thoroughly exhausted and when nobody is listening to them at all. Mainly because, it is a situation that never should have gotten to, if people did fucking listen and cared.
So great, the individual who reacted angrily is now demonized, probably will get tossed in jail for however long and god forbid they realize they're in a world of shit, that they go off themselves when given the chance.
The moral of the matter is, the next time you're dealing with an angry person, you have to stop and think a little about what world they could be in, that could make them angry at all. You'll never know, if they're someone, who's been fucked with a lot, who feel unheard, who is disrespected and somebody who isn't actually even trying to turn lives upside down on purpose.
You'll be truly amazed at times, how an angry person can change a tune when you go the opposite direction of what they expect, than just adding fuel to the fire and making them the fault of everything.
That seems like a good way to encourage that person to escalate and repeat that behavior. I've had a sister that used to be in an abusive marriage. Appeasement to an entitled angry jerk was not the solution, did not prevent him from putting her head through drywall, did not make anybody happier.
Anger is an emotion of action and can be useful against things like injustice, but it sounds like you're talking about people that don't do anything to better their situation until it's too late and now it's everybody else's fault. Your example, anger about your coworkers being jerks, has many levels between asking them to stop (5% angry) and making them regret falling asleep during the HR managed active shooter training (100%). You're allowed to be angry. You're allowed to take action because of it. You're not allowed to take it out on others. You're not allowed to engage in anti social behaviors.