I can't speak for 'everyone'.
The thing I'm getting at here is not whether you, or I, personally drive or not.
It's that public transport is built (necessarily) for the public. It's lowest common denominator. Very, very few systems worldwide are actually comfortable places to be.
A car that has air conditioning, your own seat, space, etc is more comfortable than a tube carriage that's crammed to the rafters and is 30+c.
A specific individual might prefer the cost/time/whatever tradeoff of one over the other. But to pretend that cars are just strictly inferior is only true in a situation where public transport actually works properly - which is really vanishingly rare.
Even in a place like London with its' fantastic tube network, it's completely normal for people to stand armpit-to-armpit in a sweltering carriage. A car might be slower, but it provides an opt-out for that discomfort, and some people will choose that unless you literally ban it.