Why have aliens never visited Earth? Scientists have a disturbing answer

Why would they visit us? Part of our population doesn't even know what sex they are. They'd think we were a bunch of retards.

have you seen our planet? Beautiful right?..but the natives are EXTREAMLY violent.....if they kill each other so efficiently..what would they do to an actual alien? if they have found us they are hiding and watch us ....or maybe they have put our planet in a kind of quarentine untill we get over the terrible twos..

There are ancient stories of creatures from the heavens taking human wives of all they chose. Priests claim to remove evil spirits from humans.
What if the 2014 Naval video of UFO's are interdivisional craft rather than intergalactic. That might explain the reported sightings and contact/abductions.
In any case, mass hallucinations does not appear to be correct and we have been interacting with something. Perhaps, placing 12 remote controlled lasers on an island with intersecting fire and when the boogies follow the Aircraft carrier, they get taken out for not having a visa to fly in controlled air space. We could claim those are not our lasers.
Think outside the box men.