They're killing Evos unless they can use their powers to their advantage. I don't know why, but they're willing to let the world burn to wipe us out.
Shapeshifter, I would say, since there was video. Illusions don't exactly work through tech. As to why...they wanted someone to blame. And the brown guy who has been at the forefront of Evo research was an easy target. It allowed to Renautus to blame someone "believable" and discredit his work at the same time. As much as there's bigotry against Evos, it doesn't erase good old fashioned racism.