Bullshit. He specifically named BLM and that he wanted to kill white people (which might be a plank of the DNC for 2016), especially police officers.
It has been reported over and over, including by the Dallas PD, that he was not a BLM member. Did the sick bastard get hyped up about their message? Sure. That crazy who shot up the Planned Parenthood got hyped up about the Pro-Life message. Are the RW's embracing him as their messenger, their hero?
There's no difference here.
Condemn the man who did this. Condemn any individual who advocates killing whites. Keep this debate one on one. If you don't like "racists" generalizing that all whites or all cops are bad, why is it alright for you to say that all black activists are bad based on the lunacy of a violent fringe?