Weak minded folks are at least 40-50% of the population and there is a reasonable risk of them killing the human race or at least immiserating it.
Unhinged leftists want what public ownership of the means of production whilst unhinged right wingers want concentration camps and may get them. I don't think it's reasonable to equate these things.
Gulags?
In practice it used to turn out, that "public ownership of the means of production" also implies some amount of "concentration camps" and shooting at the border. The difference is one side shoots to the inside, the other one to the outside.