We don't need to be worried about an AI that's going to fuck over humanity.
We have politicians that fuck over humanity every single day, like it's their job, and they actually get paid the big bucks for it.
Annnd people actually vote and re-elect these same fuckers into power every few years. 
While the highlighted sentences above are true, the dangers of an advanced AI becoming sentient and taking control are unknown and should be expected to be orders of magnitude greater.
We do need to be worried about it!
We?
Does "we" include very group actively pursuing and making this AI shit? Because they don't seem to care. Like at all.
Maybe take it up with them?
(Sorry, not trying to snark, but "concerned people" always seem to have the ire misplaced toward the wrong people)