Unless E.T. lands on the white house lawn to borrow a phone to call home, the majority of people will not believe in aliens.
And with the advanced techniques for special effects with more experts on effects creation than jobs for which they are applied, it would be all but impossible to trust what you see on film these days too.
What we need is evidence like the afore mentioned public landing of an alien craft, or in the case of crop circles (which I believe are entirely man made BTW)
we need to watch as they form beneath an alien craft which again rolls us right back to the "public landing".
IMHO, there is no strange vortex, or alien graffiti...only earthbound artists who have a knack for the more controversial aspects of their art.
heh,...alien graffiti...after translation what would it say??
"HorseHead Nebula West side rulez"
"Phleebitz wuz here"
"For a cosmic time call,....."