Shooting directly at any kind of alien life form in outerspace should be rule #1 of things not to do. Like FFS, people gotta be constantly reminded of how WEAK humans actually are, and that it was purely because of our technology, abundance, and intelligence to adapt, that made us thrive on Earth. BUT THAT'S ON EARTH! We literally only exist because our environment is like small compressed bubble, isolated from the rest of space itself. Even in terms of technology, if a being that flew onto our moon with ease, that's already a HUGE gap from our current technology, which can't even send humans to Mars.
Seriously, if any intelligent aliens visited earth, we'd seriously have no choice, either it's destruction or subservience, best case subordination.