Where are your priorities? You seem obsessed with connecting this to some anti Trump movement. Why? Let's say it is discovered the killer hated Trump, attended anti Trump rallies... all the things you seem to be hoping for... Do you think that means everyone who does not support Trump is capable of mass murder? The motive has yet to be determined, despite what you think you know. The fact that you think the media will "bury" the story if there is a Trump connection sounds paranoid.
59 people lost their lives, 500 plus were injured. First responders and many ordinary folks in the crowd saved lives without concern for their own safety. I doubt any of those heroes were concerned with the politics of the victims.