There is oddity going on as Cernovich dumped a post about believing Ali was warning him about El Paso a day before, then an 8chan /pol/ post emerged about "why do you not like Cernovich" and then the events from today.
We need to piece this all together one by one as there is clearly a lot of data we are not taking into account. If I cared about these shootings I would do it in an hour but, frankly, none of these shootings matter to me in the slightest so, just a suggestion, check the 8chan /pol/ Cernovich activity over the past day and add that into your research to put this event together as he is clearly connected at some level.