If you seriously believe that 4chan is in any way responsible here, you didn't think too hard about the causes. People with no place elsewhere might land there,

If you seriously believe that 4chan is in any way responsible here, you didn't think too hard about the causes. People with no place elsewhere might land there, perhaps it is even a pressure valve for people to rant to. But it is certainly not the source of these deeds. 4chan has a more international community than most comparable English speaking social media sites and yet these problems seem to concentrate in certain places.