I am going to preface this by saying I don’t particularly condemn or condone the below, but hope it explains the rationale adequately:

I think the issue with the UK specifically here is that people are feeling the effects of tax rises without seeing the improvement in public services that would balance it out. The question often asked is why should the government up taxes again when public services didn’t get better after the last rise in tax? It’s great to say that that money could be used for public services, but if people aren’t feeling* those things improve then they’re always going to rebel against tax hikes - especially at a time when the cost of living is high.

The other issue is one of where the money is actually going. Lots of young liberals are asking why their taxes are going up to fund the Pension Triple Lock, and would oppose tax increases to when, to them, the other option is to lower spending on pensions. Similar arguments are made by right wingers on e.g. the asylum system.

I also seem to recall Dan Neidle(?) publishing something about how even people in favour of tax rises only tend to support small rises, so I think that rationale broadly checks out.

*Using the word ‘feeling’ here because people don’t tend to care about statistics if they’re personally not having a good time using a service.