Eh I actually think driving is a very cognitively difficult task. This sort of "why can't people just drive correctly" mentality is part of car propaganda. Make everyone believe the system is fine, it's just those bad people that are the problem. Then rather than changing the system you just try to punish the bad people harshly enough. Which really doesn't achieve much given that the vast majority of collisions don't involve a conscious decision to do anything nefarious.