Look one layer deeper and likely the issues are classist. Of course you didn't mention where you were, but, in the places I've lived, it goes down like this: the people who are wealthy enough to not need to use use public transit have more sway in terms of voting/persuading politicians, and push for policies that directly benefit them, even if it's to the detriment of the city overall.

Thus: more resources go towards those places with insane house prices, leaving everyone and everything else behind. The problem isn't public transit, it's the wealthy.