It's unlikely that making it hard to reach 8chan / 4chan etc. would impact those shootings, no. But it may very well have had impact on the New Zealand shooting

It's unlikely that making it hard to reach 8chan / 4chan etc. would impact those shootings, no. But it may very well have had impact on the New Zealand shooting. And the Pittsburgh shooting. In the US, the bar would be pretty high for government action based on this reasoning; a direct link would have to be proven, and either an imminent threat of harm be demonstrated or the media in question be demonstrated to have nothing but illegal activities occuring with it. I don't think 4/8chan raise to this high bar. Other nations? Bar not so high.