Well, if you actually thought about it you might draw another conclusion. If you over tax the wealthy as a country you deserve to see the wealthy find alternative strategies to avoid paying exorbitant rates of tax. If you had a lower rate of tax, more wealthy individuals would chose to have the UK as their place of residency, and the greater the tax collection for the government. Low taxes, small government is hugely beneficial and creates a larger economy. Just look for instance at Eire, Southern Ireland that has transformed its economy by reducing……business tax to be one of the lowest in the EU. Guess where a lot of the large corporations make the headquarters and pay tax…..not the UK! One of my last jobs before retiring was moving the European headquarters to a tax efficient country. We chose Holland but Ireland came a very close second.
Back to the subject, I looked at moving abroad, after Brexit and for instance the threshold for residency in Portugal was low, the tax on pensions was if memory serves for expats was 10% and there is / was no death duty. Added to the better weather, lovely people and a lower cost of living why would anyone choose to live in the UK? There are a number of countries that a pn average pension will allow you live like a king rather than a pauper as is the case in the UK.
The only reason we are still in the UK is my wife wants to be close to our children and grandchildren.