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Until they invade, at which point humanity unites and royally kicks their rear ends.
That's how it always works in the movies, right? Well, except Skyline, but that one was stupid.
Then again, they may be terrified of us, since we're so warlike that we're perfectly willing to detonate nuclear weapons in our sole biosphere. Can you imagine what would happen in REAL life if a giant alien ship descended over Earth? It'd get every nuke in the arsenal sent towards it. There's actually a book series that deals with aliens invading Earth - aliens that have never met any species that can fight back. They find Earth... rather unpleasant.
If aliens were real and were totally unified and never fought each other, odds are good that human weapons would be way superior - after all, warfare is what drives weapons development.
BTW, I don't think aliens exist - this post is just for fun. Although the subject is fascinating to hypothesize about.
Good point. We certainly are a bloodthirsty and violent species, so maybe we'd be able to hold our own against some of the smarter and more peaceful aliens.