Look around. See any?
Illegals don’t count. ;-) This is exactly what the Fermi Paradox is about. If there are sapient aliens, where in the heck are they? Go read about it a bit. It more or less supports your contentions.
Oh, and the other thing: In about 50 million years, the sun gets very inhospitable to life as we know it on earth. Given the insane scale of what we would need to do to travel interstellarly, we’d better get on with it.
;-)