UK income tax was notoriously applied as a temporary expedient. The low tax fans want a return to the pre Victorian levels of poverty that went hand in hand with the non-welfare state.
Low tax advocates want a more streamlined government that looks after core functions (managing trash, police, etc) rather than what it has taken on today (entire multimillion dollar agencies tasked with getting more women into high status jobs, regulation of the size and shape of cabbages, etc)
The idea that "people who want less tax than I do just crave widespread poverty" is a sign you have an ideological brainworm. No one thinks like that.
Plenty of people think that. They might not admit it publicly (or even admit the full implications to themselves), but they still think it, and more importantly, try to act on it.
This is just something people believe in your imagination.
Hard to imagine healthcare is run on a lean, waste-free budget with that sort of stuff.
(Cue discussion about covid rationing involving "equity" considerations, etc)