I guess this just goes to show that you can take a ridiculous, narrow-minded and idiotic concept, dress it up in an intelligent manner and convince hordes of people that you're a genius. Before I go more into this I'll just point out that I'm not some raving Halo fan-boy or anything (never owned either Xbox for starters, I have played 1,2,3 and Reach thanks to friends though and they aren't spectacular, but they aren't as bad as most of the internet community would have you believe).
Now that I've covered my back from anti fan-boy rage I'll continue. It actually annoys me that MovieBob's videos are so popular. He comes across as an elitist douche a little too far up his own ass for his own good and then people take his word as gospel a lot of the time.
Keeping with the context of the video, no matter how much you say "it may not have been intentional" it won't make your point any more valid. The Covenant brainwash entire species into carrying out a sequence of events that will bring about the destruction of all sentient life. Seems like a good enough reason for humanity to want to fight them off, does it not (well that and the whole randomly being attacked by the Covenant first thing)? It has nothing to do with some racist undertones that the humans may have (hell, they even tried to make the "faceless" Spartans more diverse with Reach for crying out loud). Maybe over-thinking without having a full understanding of the story isn't such a good idea after all, something you might want to take into account with every other video you make.
TL
R? MovieBob is an elitist tool and that's the Big Picture.