Well it is a US company... In the US, you are allowed to possess or distribute photos from concentration camps, 9/11 footage, and yes, the Christchurch video. You don't need a special journalism license or a law enforcement badge. Many sites understandably choose not to host content like that, but it's important for some places to be willing to host primary source material. Otherwise the event will just fade from our collective consciousness, or will end up getting distorted or twisted into a conspiracy theory (eg. Holocaust denial, 9/11 truthers, crisis actors, etc).

I believe this content should actually be kept up somewhere. If you burn your records, you will most likely make the same mistake twice.

Explain how refusing to censor content or turn over PII on a government's behalf, something which many companies due, relates to "acting in bad faith".