That is the most convenient possible world from the perspective of making the grandparent's point. Was that your intention?

Well ... yeah. The least convenient world for avoiding the point.

Hey, I didn't name it. shrugs

The least convenient possible world would have all the copies united in favor of the original Dr. Evil.

That is less convenient.

The world that I infer is imagined in the original post (also fairly inconvenient to the grandparent) is one in which Dr. Evil wants the universe to be shaped according to his will rather than wanting to be the one who shapes the universe according to his will. This is a world in which having more copies of himself ensures that he does get his way more and so he has an incentive to do it.

Yup, that's what I meant by "the copies are united".