Our politicians of the last 30 years or so have actually created a mindset of tax avoidance by deliberate policies. It was once the case where paying tax was considered something good, and still is in many countries, but here in the UK, it seems to have become a race to the bottom with people wanting to avoid paying taxes at all aided and abetted by politicians of all colours!
Raising personal income tax allowances and employee NIC starting rate so that no one pays either until they have taxable income over £12.5k.
No income tax, capital gains tax, etc., on potentially hundreds of thousands of pounds of savings/investments in ISAs
Zero rate tax bands for small amounts of interest or dividends
Upto a further £5k of tax free interest via personal savings allowance on top of tax free personal allowance.
Tax relief on pension contributions
Govt tax rebate top ups on help to buy ISA
Tax reliefs on VCT and EIS investments
All sending a strong signal encouraging people not to pay tax.
And that's just the legal stuff. We also have an almost total lack of enforcement of tax evasion, i.e. black economy, cash in hand work, cash in hand VAT free tradesmen, selling duty free booze and cigs, etc etc. The black economy costs the country tens of billions per year due to lack of HMRC enforcement.