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The terms of service permits Google/YouTube to terminate an account for basically any reason. On a purely reactionary level, shooting at a company's employees is a pretty good reason for account termination.

Edit: As mentioned in an earlier thread (https://news.ycombinator.com/item?id=16751945), apparently YouTube doesn't have a blanket account termination clause in the terms of service. I stand by my rationale, but want to make it clear that I actually got this wrong.

Probably because you dont know what she put up there, and you dont want to give an attempted murderer a giant platform, as a win.

I do know what she put there, though, since on the internet is is fairly trivial to see what was on a publicly available and commonly crawled website before it was removed.

And there was nothing that related to the killing, and nothing even tangentially related to the ban message. No 'final manifesto' or anything like that.

If you are curious, here is a mirror of her videos: http://www.dailymotion.com/yesilnasim/videos

Those have also all been removed

It's general practice to shut down accounts of people who perpetuate infamous criminal acts, so as to at least prevent copycats.