Do you have evidence that speed cameras with fines are clearly proven to "keep people from getting killed" because I'm pretty sure their primary purpose is revenue generation.

Edit: looking into it, it seems the majority of the available data generally indicates a reduction in collisions and fatalities but apparently the methodology across the various studies has been pretty inconsistent so there's no hard numbers. But apparently they range from no reduction at all to 70 percent from my glancing at the data, apparently how many cameras how far apart and how far from the high traffic incident area are the main determining factors in reducing accidents. I may have overlooked it but I didn't actually see anywhere that shows the speed reduction after camera introduction though.