There is absolutley no reason for any species capable of traversing the vast distances between stars to be interested in us.
This is the may key of why I don't belive in ET neither,nothig alive can't travel even to a 10% of the speed of the light ,well it can, but will die, the worm holes are therys from einstein-rossen to determinate a mistery in a quamtum teory as the taquions particles a bunches of theorys to find out a quamtum mistery, wich later Bell's theorem fits better.Remember Alpha _Beta Centaury are the closest star to us ,only 4.5 light years away to reach it in the humand posibility,It should take 10.000 years...
But,I can not denied that there's a mistery in all of this,there are too many withneses,too many thing strange things,in all of this UFOS,..you know once I think perhaps they are us traveling thru the past,Outrageus ,isn't it :P, But check out in mesures the distances among stars,you,ll find out that said
they are comimg from the space to us is more absurd..