Yeah indeed that would be a dumb thing to do, but luckily nobody serious proposes such a thing. Most economists (Piketty, Zucman, Chang et all) target the problem of asset values growing faster than the real economy, and propose taxing these assets so the values grow at roughly the rate of the real economy, driving up the incentives to invest in actual things like innovation and industry.
But even the most modest proposals, eg 2% on 100 million and above, are of course met with hugely vituperative campaigns against. But think about it for yourself. Tax policy is, or can be, a tool for supporting our economy, incentivising productive activity and discouraging unwanted behaviours. The question is, what do you want?
I want trains that go at more than 15 miles an hour, clean water, affordable energy, effective reskilling for adults for our modern flexible labour market, support/incubators for new businesses, startups and innovation, opportunities outside London, and a way for the bright minds and ambitious people of this country to do well here, and not have to emigrate to the US like I may soon have to. What do you want? Do you think we're getting it right now? If not, what should we try to change?