Why do lefties equate the US being a "melting pot" to allowing literally anyone in?

The US has accepted people from different cultures and regions, but that is not exactly the same as opening your borders wide-open, allowing freeloaders in, and flooding communities with hoards of third-world entitlement junkies while severely altering the cultures of an area.

Non-US foreign nationals coming to stay in the US is a privilege, not a right! When you enter into a sovereign nation, you respect their cultures, norms, and practices. You don't demand anything and you most certainly do not stir trouble or exploit their citizens.

Why do lefties equate the US being a "melting pot" to allowing literally anyone in?
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