How do we know that she didn't specifically only go after those 3? Could have simply been targeting those few, and no others.
Now whether she meant to kill them or not is another question, because she utterly failed in that regard. She even went to a shooting range before the deed, but I wouldn't expect most women in California of all places to know how to shoot.
Now you're gonna have California crying for even worse gun laws. Expect to see Youtube itself leading the charge with an online video campaign. All steering any attention away on why she did it, which we may never truly know, because no one's talking at Youtube, due to a strict policy regarding company details and internal matters.
Shit, those Parkland kids might even get involved.
They'll all turn this into a gun issue, and Youtube will continue being its increasingly corrupt self, hiding the real issue. Sounds like she had many of the same gripes that countless Youtube content creators had. She was just in a unique position to attempt to do something about it. Few will agree with her method, but most know that something needed to be done.