We now want this ball of cells to start to gastrulate, to turn in so that it will produce the other tissues.

First of all, to your first one: there's no question that we've changed, that we now want a person to love, and for thousands of years, we had to marry the right person from the right background and right kin connection.

And their response, of course, was no more than we wanted to stop the genocide and put our troops in harm's way to do that, nor do we now want to get in the way and pluck genocidaires from camps.