Well, If I were National Security Advisor to any of the Meso-Americans circa 1492, that's what I'd recommend (less a few hostages and study samples).

At least, that is the lesson I've drawn from their subsequent experience of being slaughtered themselves and having their entire civilizations wiped out.

I even recall reading a legitimate government think piece that advocated slagging the first, and all subsequent UFOs that land without asking nicely first, with nukes, and made a pretty convincing argument for it, too. Alas, that is lost to the dim mists of my memory. I'd love to re-read it.

Jeff