I thought Youtube, and California both hated guns!
Breitbart.com
In all seriousness, Yes this is tragic, and like every sensible person, I wish this would never happen. 3 wounded(1 in critical) and a dead gunman. But I really wonder how quick this event will be silenced.

Gunman was found to be a WOMAN, in a HEADSCARF, I.D to be Nasim Aghdam, according to witnesses. Absolutely Inconceivable! NOT a white male conservative member of the NRA as the Media LOVES to blame. Say goodbye to youtube gun channels. From now on, get your reviews from Full30.com

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And don't forget that apparently YouTube HQ is a gun-free zone.
How did the gunwoman get one in there?
This shouldn't be possible!!!

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And so it turns out the shooter was a vegan animal rights activist who made bizarre videos that nobody liked. http://metro.co.uk/video/nasim-aghdams-bizarre-videos-involved-dancing-veganism-1662106/?ito=vjs-link
No wonder the media is silent about it today.

Update
https://www.louderwithcrowder.com/report-did-police-drop-the-ball-questioning-the-youtube-shooter/