Are you making a parallel between isolate yourself to not catch and spread a disease with "isolationism and xenophobia"?

I sure hope you (and people in general) can separate the 2 concepts or we're really doomed.

Agreed. Responding to these situations is in part a collective test of practical intelligence -- or of collective intelligence if you will. Part of practical intelligence is to be capable of precise language (and separating concepts, as you say).