I have no desire to educate but I have to indicate that there is plenty of research on why people prefer cars and that’s not it.
Still, assuming that walking from home to a train / metro station is a problem has to come from a car centric place. It’s ridiculous. In many cities that is the best part of the day for many people. You rarely hear from people driving that car commute is the best part of their day.
In very specific situations (in the summer on a sunny day in a low-crime area when its just you commuting with no small children or excessive cargo and no time pressure) walking a few blocks to and from a train station could indeed be a pleasant experience. Take away a few of those points though and cars start to look pretty attractive again. Even more so if we're talking about a hypothetical self-driving future where several of the few remaining disadvantages of cars have been mitigated.
Still, assuming that walking from home to a train / metro station is a problem has to come from a car centric place. It’s ridiculous. In many cities that is the best part of the day for many people. You rarely hear from people driving that car commute is the best part of their day.