Meanwhile, there are millions of wrecks every year in the US alone. I'm sure a large portion of those drivers said the same until they got hit. You need only browse /r/IdiotsInCars for a few minutes to witness the full range of ways people with the best of intentions can get in wrecks because someone else acted like a fool, and how many could have been prevented with lane keeping and emergency stop features.
The roads are a highly regulated public space where safe, smooth motion depends on everyone working together, and where one little error can throw it into chaos. Everyone will mess up if they live long enough. You can make some philosophical argument against mandatory safety features if you like, but I hate driving as it is and welcome any feature that reduces the odds or severity of the inevitable results of the limits of human perception and reaction time.