The name of the shooter is Juraj Cintula. Much like any indoctrinated leftist, he's a "writer and activist". He is a cofounder of a group Dúha(Rainbow). What's funny is that at 71, he remembers what communism was actually like and had to have a real job. The only possible exception is that he escaped to the west and then came back as a "dissident" on his white horse after the fall of communism. Many of these Soros funded and trained leftists fit that mold.
This shooting doesn't even need to be centrally planned. The indoctrination is so strong, they are preprogrammed. It's just like with voter fraud.