Belief in the possibility of aliens does not require you to suspend the laws of the universe we live in, unlike gods (it is a question often posed by the religious because they think aliens and gods require the same type of belief). If aliens are extant then they have evolved just like us (unless they popped in to existence...) and require no special pleading to make a place for them in our universe.
However the idea that they have decided to sneak to us without us noticing (aside from some grainy videos and anecdotal stories) and abduct us is stupid and without evidence. So are we to believe that an alien race that is advanced enough to circumvent our monitoring stations, isn't advanced enough to fool cousin Billy-Bob who remembers being 'taken' and anally 'investigated'.