because it has other people on it? personally I find that sitting down and getting passively carried near to my destination is way less stressful than paying attention to the road that whole time - not to mention finding parking. You don't end up exactly at your destination, but a little bit of walking is good for you.
Assuming you live in a locale with a reasonably efficient system. I've heard some horror stories about north american public transport. Other countries tend to do much better with timetables and routes.
I've never caught a train nor a bus in my life and intend to never do so. I value my privacy and don't want to get stabbed or sit on a chair where someone has pissed all over.
It really depends, I would much rather travel by NYC subway or Vancouver SkyTrain or Seattle light rail if my origin and destination are within walking distance. It's the least horrible option in many cases. Good luck to anyone's stress level and pocketbook trying to commute by car in much of NYC and pay $550 a month for parking.
Right, I could have written that much more pessimistically with 850/mo parking, insurance, congestion charges 5 days a week x 2, cost of car insurance, maintenance, fuel, cost of the car itself, etc.
Assuming you live in a locale with a reasonably efficient system. I've heard some horror stories about north american public transport. Other countries tend to do much better with timetables and routes.