Well sure, if you want to go with the simple, logical answer...
Ok, the more complexe answer is that the US government with the collaboration of the Illuminati as hidden the Draeneis because they were based on real aliens.
Doesn't look half bad. Didn't see any of the other races though, maybe a quick glance at trolls?
Probably won't see it in theaters but might rent it.
AR
I've not played the game, but that trailer looks utterly awful. I'm sure it will make tons of money.