I haven't posted on the shootings of the last week because, frankly, what little I have to say at this point has been said well by others.  Matthew Hennessey has this article at City Journal. Here is the concluding paragraph:

The anti-cop Left never hesitates to run with its preferred narrative--that racist police are hunting down young black men and murdering them. But those with an interest in truth and justice should wait for the facts. It could turn out that the killings of Alton Sterling and Philando Castile were entirely unjustified, much like the 2015 death of Walter Scott, shot eight times in the back by a North Charleston, South Carolina, police officer as he tried to flee. Or, it could turn out that Sterling did have a gun, and that Castile either argued with the officer or disobeyed his instructions (which may or may not justify the officer's actions). We just don't know yet. Until we do, reckless allegations and media-driven narratives won't do us any good. 

In the same publication, Bob McManus has this article:

Baton Rouge and St. Paul, like so many of the similarly tragic police-custody deaths that preceded them, may have been the product of circumstance, or of incompetence, or maybe they were even crimes. Each must be examined in context and judged accordingly. But Dallas was cold-blooded murder--nothing more, nothing less. Attempts to assign equivalence to the horror of it--to suggest, as some are doing on social media, that Dallas is somehow just deserts for Baton Rouge or St. Paul or Baltimore or Ferguson, or even for Eric Garner's death on Staten Island two long years ago--is morally repugnant.