That's a pretty warped view, 8chan is the support system for radicals which in all likelyhood gives them the motivation to commit mass murder since they have an audience to play to and support for their demented views.

As the article states, it's very likely 8chan is just going to use a competitors service so it's unlikely to cause them much disruption, but at least Cloudflare isn't going to feel terrible for providing Internet services to the cesspit that formed the mind of the next radical that's going to commit mass murder and announce it there.