Actually, it is the other way around.  The Dallas police killings happened because of the murders of two black men in Baton Rouge and Minnesota by racist white police officers this past week.  The Dallas shooter Micah Johnson made it most clear in his phone conversations with police that was the reason for his attack.   

Do you honestly think that the Dallas incident would have happened, if those two black men had not been executed??

If white police officers continue to gun down black people like this, no one will be surprised if more blacks don't decide to retaliate.  This cycle of violence has to end.  

And it was most definitely NOT Black Lives Matter that inspired Johnson to kill.  All other press reports say that he was a follower of the group called the African American Defense League, which is on Facebook.   AADL specifically called for black people to kill white policemen this week.  Look at their Facebook page:

https://www.facebook.com/aadlafricanamericandefenseleague/
.