Everyone keeps saying how easy it was to find. My experience was different, eventually came across a torrent of it but it took me surprisingly long, 30 minutes or so. Maybe im bad at googling?
It was very easy to find within the first hour or so of the news, at least. I googled the name of the shooter maybe half an hour after people started tweeting it, and the first Google results were YouTube videos containing some of the footage [0]. It actually surprised me that Google's search results would put YouTube videos at the very top of SERP for a term that had an anomalous spike (because of the shooter's uncommon name). I'm less surprised that they hadn't manually blacklisted it -- I don't remember when I first saw it on Twitter, but it wasn't from news stories or an official source.
0: https://i.imgur.com/rBZcdCa.png