I'm astounded the conversation is still going.
Surely if any rational person sits down to think about the combinations of unimaginably difficult barriers that ALL need to be surpassed for any alien contact on this planet to be even possible, let alone happened, then it becomes obvious that the conversation is pointless.
At least ALL of these things need to be true:
Life must exist elsewhere (possible, maybe it does / maybe it doesn't - we know it doesn't exist on several planets and it almost certainly can't exist on billions of others)
Any such life must also have reached a state of self-awareness (possible, but almost all of the life that has ever lived on this planet is/was not)
The life forms must also have reached a level of intelligence to understand the concept of planets, stars and galaxies (possible, but in the 3.7 billion years that life has existed it was only in the last few hundred years that we understood this)
The life forms must also NOT have reached a point of self-destruction (based on our own experience this seems unlikely. We haven't been around long and we surely have less time left)
The life forms must also live within a radius of only 130, one hundred and thirty, light years in order to have detected us by radio signals (vanishingly, staggeringly, utterly unlikely. Of all the billions of light years of range in the universe, and we only "know" about the observable universe, for the life forms to exist in that tiny back garden radius from Earth is just unimaginable.)
The life forms must also have detected us (maybe)
The life forms must also have understood that radio waves meant other life forms, and have been able to trace the origin (maybe)
The life forms must also have wanted to get here (would you?)
The life forms must also have been able to get here within 137 years (max) which means travelling at the speed of light or faster (as far as we know this is impossible, so this should rule it out as a silly idea immediately)
Having done all that... and there are probably loads more conditions that need to all be true.... we are still then being asked to believe that they have arrived, undetected from all of our SETI instruments and the paranoid early warning detection systems, and have only been picked up and are known about by people who sit in their underpants watching YouTube videos.
Give your heads a shake man! Keep watching Independence Day, playing your Space Invaders games... but stick your "evidence" up your pipes.