Argentina (the end game of social democracy) pre-Milei had a huge array of taxes and regulations which lead to the state misusing that money to actually enrich a small elite of politically aligned. Similar things and arrangements (under the form of subsidies to companies) will happen under Trump and levying more taxes will just give more opportunity for corruption.
In France wealth tax was repealed in 2017 I think but will be soon reintroduced under a new form.
Hence the proposal by many economists that the only solution is a broad agreement on a global progressive wealth tax, with at least the major blocs of the US and EU on board. See e.g. "A Brief History of Inequality".
The same proposal is also criticized by many economists too, who argue that inequality has not risen as sharply as Piketty's crew claims, or that the bulk of that inequality is linked to the real estate, for which the only solution is build more houses and destroy the capital accumulation of older generation to the profit on newer ones.
1: https://www.brookings.edu/articles/deciphering-the-fall-and-...
But I would argue that the situation in housing is actually a consequence, and not a separate phenomenon, of the broader issue of inequality-driven asset price inflation.
The problem with countries like UK is that real estate is the only way of obtaining, growing and keeping wealth there. And I mean the only.
If this were universally the case, open source would not exist.
Greed is an innate human trait.
Those are not the same, but too many don't know what's the differrence.
BTW: Most of the world lives under state capitalism, not capitalism, not socialism, not any other form of economic system. The state has an unrestricted claim to any and all of your wealth.
European social democracies are among the top of the wealthiest countries in the world.
Just a thought.
You seem to confuse capitalism with market economy. Germany's social market economy was conceived as an alternative to capitalism; a market economy with strong focus on unions and social fairness/justice. In other European countries is very similar.
Socialism core principles have always been égalite, solidarity and democracy. It's pretty silly to think that a highly hierarchical, unjust and undemocratic system has anything to do with Socialism.
Hint; it doesn't. It might say so on the marketing material ("Socialist Republic!") but that's just that - marketing to fool the numbnuts.