1. Public transport is filled with the sort of people who use public transport – namely, those who can't afford better.
2. Private transport is objectively superior in every measure of comfort and privacy.
I've seen a lot of bikefags and busriders get angry about these two facts, but have never seen them refuted. Even the nicest commuter train barely keeps up with an entry level luxury car in comfort, and has all the privacy of an Indian cattle car.