All analysis come with a political agenda because tax is a political and fiscal tool that governments of any hue can use to garner votes.
What levels of taxation are acceptable depends on political positioning. When I started work I paid 33% tax which I thought was fair and I was given a tax cut by the Thatcher government that I just did not need. On the same wage now I would pay lowest rate of tax and would be better off but I would not need it. I personally would prefer to pay more tax so it funds decent public services and pensions.
It comes down to statist/individualist positioning, the Tory party believe an individual has the right to spend there money as they see fit, Labour prefers that social provision is good enough to alleviate poverty.
There is merit in both arguments, neither are totally right nor totally wrong, the trick is finding the correct balance. Under the Tories the pendulum swings one way, under Labour it swings the other and the result is the tax code is now so complicated it is as thick as War and Peace. I would prefer it was slimmed down and most governments promise to do that but never do, they introduce measures to buy power. It is a rather ludicrous state of affairs when you actually think about it.
I would actually hope everybody would see that taxation is necessary for society to function, only extreme Libertarians would say different I suppose, but one thing that can not be doubted is that taxation has increased living standards across the board. We probably live in a more equitable society than ever before yet still their are anomalies and their are winners and losers.
You often hear Labour tax proposals as being in the same vein as Dennis Healy's famous "tax them until the pips squeak" speech. What people don't know is that is this a misquote and Healy was not referring to the rich, but to property speculators. However the narrative stuck and the Labour party is addled with that quote now. It is a rather clever piece of media manipulation of the masses.