UFO'S and Mexico?

I was thinking if ET came from someplace were their planet was warmer than ours would it not be the smart thing for them to be scoping out warmer places here on earth like Mexico. from my understanding that's were most sightings are, this is just a thought i am in no way an expert in this UFO thing just pondering a question. and to go out on the limb even more, maybe this global warming thing is them making things more hospitable for them?

[edit on 17-11-2006 by skitzo]