And why wouldn't we?!? Because of monsters like the UE, people who could've lived long, happy lives were killed! It doesn't matter whatever the reason is, what they and so many other aliens do here is just kill and kill!

Why shouldn't we worry about it and try to defend ourselves? For that matter why don't you seem to care at all about it?!?

[Yeah, your sheer flippancy is just making things worse.]