Same reason everyone does, they don't want to have to rely on someone else for their trip home.

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Need to run out the door to make a specific commuter train, and if it's cancelled, might be hours of waiting or shuttle buses. Sure, doesn't happen that often...but everyone would rather be in their own car, with their own sense of control over the situation.

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It doesn't help that we spent the past 2.5 years beating people over the head with COVID and social distancing. Huge numbers of people are still never going to get into a crowded elevator ever again, let alone a subway train. Shit, I see people wearing masks walking down the street, outside, alone. Of course people would rather drive.

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And that doesn't even get into the high profile media reports of random nutcases attacking people on public transit. Everyone's on edge.