Argh. Okay, look, I'm counting loved ones here in this 'self-preservation' point. Yes, parents save children before themselves, people occasionally risk themselves for a random person who's in a dangerous situation. Yes.
But as a species? Even as countries, nations? Hell no.
Things we don't UNDERSTAND, we fear. We try to gain knowledge of, try to control. Subjugate, even. If we're talking about big-league important once-in-a-lifetime stuff like aliens coming to earth? Humans are going to be skittish about that, unsure, fearful. With the authorities taking a more "let's learn about this thing" approach. It's just so very obvious that if a flying saucer crashed somewhere out in the desert that the military would make attempts to contain it. That's not science-fiction, that's policy.