The justification doesn’t really matter. The point is this is the situation the makes “all socialist countries are bad” a belief people hold. It’s wrong. It’s “the only socialist countries who could survive capitalist intervention also did bad things. The ones that didn’t last are forgotten and we can’t know how they’d fare.”

The reason why the Cold War was happening at all was because the US shoved themselves into a role of preventing “communism,” which extended to any leftist government, from spreading. They needed to ensure socialism couldn’t achieve its goals, because if it could then other capitalist countries would see the benefits and follow suit. Obviously the owner class in capitalist nations couldn’t let that happen. You can even see it even within the US with the dismantling of leftist policy.

Socialism isn’t bad. It’s what capitalists forced socialism to be in order to survive that’s bad. Capitalists are the issue with socialism. To use it as an argument for capitalism seems pretty fucked up. It also ignores all the harm done by capitalism. This mostly happens outside of the rich countries though, so most of us don’t interact with it.