You don't achieve that by talking down to them, treating their choices with disdain, or telling them that they expect to much. You do that by giving them a vision they want to fight for & a path to fight for it. A vision, for example, where you don't need to drive, but you could drive - and that driving experience will be even better than today. A vision that you wouldn't want to drive, even though the driving experience is even better than today, because the alternative is even better than an improved driving experience. That's how you achieve support.
If you tell them they should stop using cars, they're going to ignore you, because there's no better alternative or even remotely equivalent alternative. If you actually try implementing it without making a better alternative, they're going to resent you and your goal.
But the frame of the discussion right now is to punish motorists for being motorists - they don't have a choice. They can't afford to live closer (or there's no options that give what they are looking for), and there's no safe, fast, or convenient way to any place they need to go without a car.
Give them a safe, fast, and convenient way from suburbia to downtown, and they'll support reducing highways into half their size. Right now, the discussion is "suburbia bad, car bad, you bad - be better"