Per mile driven I expect it's true, just given their greater experience than most drivers. Not that I disagree with you that many Uber drivers are not actually great at driving, but neither is the average driver in North America. I expect we just notice rideshare drivers' mistakes more, and get exposed to them at a greater rate.
There's probably some sort of bias here when you observe someone else driving - it's like that joke - if someone drives slower than you - just curl up and die already boomer, and if they are driving faster than you - what an absolute psychopath.