Why won't Extra Terrestrials make contact with us?

Mature answers please. I want to know why Aliens don't make contact with us? Dont give me "Aliens dont exist" stuff because they are and for you that dont believe in them are simply lying to your selves. Also dont give me "Because we will kill them" crap because if aliens could travel from their planet to earth. Don't you think they would be more miltary-ly advanced then the whole damn planet? They may have laser beams and stuff. Also don't give that because I'm talking radio contact with like a video thingy. And also anyone stupid enough to shoot a flying spaceship may be turned to dust with the push of a single on. Or whatever the hell the aliens do to fire their weapons.