Except they don't.
Part of the political crisis engulfing the US and the UK is that IT IS PRECISELY THOSE THINGS THAT COMMAND POPULAR SUPPORT that both political parties will not do.
If "no public money for illegals" was on the ballot in California, it would pass overwhelmingly again.
This is not a Democrats vs. Republicans issue. This is a government vs. the People issue, just as Brexit is in the UK.
Here on the MA state tax form there is a check box for if the common MA leftist wants to pay more in income tax to fund their noble causes.
Something like 1% ever check it..