 Oh, sure. They could come to trade, of course. Import, export. That wouldn't hurt. Or maybe these creatures will be aesthetic marvels, nice and friendly and polite and underneath the Tojo type. But am I going to risk the possible future of the human race and I guess that it's safe to trust them? The one thing I won't risk is having them know how to find Earth. Either I know they can't follow me or I don't go home.