To me, one of the most profound questions we can ask is: "So what?" And so what if there's an indefinite number of worlds with alternate "us-es" in them? The "so what," to me, comes alive when I ask myself: "What if I could find a way to get in touch with those alternate mes who made those choices?" That is, persons who, if I saw them now, I wouldn't even recognize because their choices, once small, have multiplied to make them such different people.
There are at least 23 countries that refuse to take their people back after they've been ordered to leave the United States. Including large numbers of violent criminals, they won't take them back. So we say, OK, we'll keep them. Not going to happen with me, not going to happen with me.