I don't know if you're (purposefully?) conflating tax relief with tax avoidance. But I will give you the benfit of the doubt.
The examples you have given are for specific government initiatives with a specific purpose that benefit individuals WHILST also benefiting wider society.
Eg. Pension contributions allow wider economic investment, electric cars help reduce overall carbon emissions...
As HMRC themselves say "Tax avoidance is bending the rules of the tax system to
gain a tax advantage that Parliament never intended.
It often involves contrived, artificial transactions that
serve little or no purpose other than to produce a tax
advantage. It involves operating within the letter – but not the spirit – of the law"
I also vehemently disagree that it is 'human nature' to avoid paying more tax, especially if that tax has a measurable wider positive societal impact. Its not a mere coincidence that some of the countries with the highest taxation are also invariably top of the happiness index. Even in our own country, people willingly supported the implementation of the welfare state and have consistently supported (evident through various IPSO data over the years) higher taxation towards better public services.
If this is news to you, and not something you've heard outside of Mumsnet, then perhaps that is more a reflection of the confines of your social circles...The data simply does not match your experience.
What I think many people DO have a problem with, is austerity and the continuation of taxation when nothing is improving. Especially when so many of our 'public' services, are being contracted out to private entities who award what many see as extortionate salaries to their execs, and take hardworking taxpayers money from, in the form of dividends and bonuses.