To everyone saying that they should be given the opportunity to join our civilization, it's not like they have a choice. They'll die if they get the common cold

To everyone saying that they should be given the opportunity to join our civilization, it's not like they have a choice. They'll die if they get the common cold or flu or at the very least come close to death. And how do we know that our civilization is "better" for them? It's not like they could become incorporated into our society anyway (not the current generation). Contacting and converting them is more an act of self-righteousness than anything else.