Capitalist countries have border guards to keep foreigners from coming in illegally. Socialist countries have border guards to keep their own people from escaping.
Capitalism does not enforce behavior patterns. You are free to opt out and be poor and not compete with others, if you want. You can be homeless, or subsist on minimum wage, or go on welfare benefits, and many do.
Compare this to socialist economic systems, where opting out is illegal and classifies you as a social parasite. "Being unemployed" is a felony that gets you ten years in a forced labor camp. "Complaining about how it is unfair that you are not allowed opt out" is also illegal, and also gets you a stint in the labor camp. That's "enforced behavior patterns."