They gave up control to the visitors. I think they did it initially to buy time for the human race, but as time passed and humanity turned on itself time and again, the cynical bastards stopped caring about what they were doing.

I would say I couldn't blame them, but that's a cop out. It's one thing to tell the visitors you'll go with their plans, but it's another to infiltrate the food chain and turn it into a psychotic knitting pattern. If a food chain is a straight line from top to bottom, what they've done is created a blob with lines radiating out in all directions. And we are no longer at the top.

The dumb, stupid and evil bastards have ignored their obligation to their humanity, and deserve to be spit upon publicly.