It's not so much that voters are selfish (although some are; probably 20-30%) as that they don't like being ripped off and it has become very clear over the last ~30 years that all the happy talk of market economics is mostly self-serving BS.

We've seen from recent economic crises that people are willing to tolerate and even vote for austerity; but since then they've noticed that all the austerity happened to people at the bottom of the economic pyramid and those at the top barely suffered at all. They've also noticed that a considerable portion of their taxes is pent on policing whose purpose is not the prevention of crime but the maintenance of the economic status quo.