Socialism is defined as the government owning or regulating the means of production.

When there's an actually well regulated market, like say, we have here in the Nordics, you'll tend to see other socialism alongside it. We have good social security and labour laws. Exactly because it's regulated market economy we utilise.

Capitalism does not have aa monopoly on market economies.

Capitalism is to market economy what cancer is to cell growth.

Even the US employs socialist policies. As in the policies themselves are socialist in nature. Antitrust laws. Because without them, capitalism would fuck over the economy in a heartbeat.

If something has been shown to not work it's capitalism.

Capitalism is the antithesis of a well regulated market and will always fight regulation in any form, because it's harder to make profits if you can't sell unsafe garbage and exploit workers to their death.