Methinks that an over generalization there in that asserted tendency.

I've seen lots of human innovation. Never seen an alien. That some seem so eager to promote the idea it's aliens seems like some kind of purposeful ploy.

The "we" that has such technology, I am not in:

“We already have the means to travel among the stars, but these technologies are locked up in black projects and it would take an act of God to ever get them out to benefit humanity… anything you can imagine we already know how to do.” — Ben Rich, former Head of the Lockheed Skunk Works

“It is easier for us to pay a private contractor to re-invent something so it will come out at a lower classification level, than to try to declassify it.” – Bennett Hart, then Deputy Director of the National Reconnaissance Organization