Larry while there are common threads running through the incidents we still are very early in discovering facts.
The use of terms like "law enforcement's recent executions of two black men" drive a predetermined judgment. "Execution" is inflammatory and not accurate. It may turn-out police were wrong or they were right, or they were acting in good faith and still wrong or an infinite variation on the former ideas.
I doubt anyone can responsibly determine to a complete degree of actual certainty at this point with the evidence in play. IN a short time as data if organized, validated, and published will tell us more.
What previous incidents have shown is that out and out deliberate with malice of forethought murder by police is rare. To term the recent deaths as "executions" is not only flawed, but rather ignorant of reason.
Further most incidents involve a degree of physical resistance to arrest. The Castile incident by the immature set of data we currently know is an outlier.
The beatification of every supposed victim, i.e. Michael Brown, is flawed, just as a beatification of all police actions would be.
What is required is the building and enforcement of safeguards so that both citizens and their law enforcement can maintain a peaceful and safe society.
Ideas such as police cameras in addition to dash cameras; external investigation by another agency to remove perceived bias, civilian review of law enforcement agencies, all help create a better environment and trust for communities.
Besides police cameras are really giving us some truly funny youtube videos to watch that demonstrate that police are not the automatic villains that lives matters group pose