alt Hacker NewsThese would be examples of normalization, not a slippery slope. The OP's example makes this clear (from "congestion pricing in NYC" to "they're going to take my car," not "congestion pricing in NYC" to "congestion pricing elsewhere").
(Regardless, I think the answer is simple: congestion pricing is only economically viable when an area is simultaneously congested and has alternative transportation methods that would prevent the local economy from collapsing. NYC is one of a very small handful of cities in the US where this is true, although that's largely a function of 80 years of car-centric design. Maybe it will change.)
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Numerous politicians and advocates have suggested exempting electric vehicles from the NYC congestion pricing. Such vehicles are exempt in London. It isnt unusual for governments to start a program with one goal or purpose, then expand it (or use as a launching point) to achieve further goals, such as banning ICE vehicles.
This is currently happening with cigarettes. Banning them at workplaces and other public places is one thing. But we live in a capitalist country that celebrates individual freedom. Or do we? Beverly Hills CA and Manhattan Beach CA have both banned the sale of cigarettes entirely. Massachusetts banned all flavored cigarettes and is trying to permanently ban the sale of cigarettes to anyone a born after a certain date.
These go beyond "normalization", it is exactly slippery slope... get a small foothold then keep expanding the position.
"normalization, not a slippery slope"
Sounds like an arbitrary distinction, but in any event, it was the OP who used "slippery slope" to refer to going from "congestion pricing in NYC" to "they're going to take my car."