It has already been said, but this is not a gun law issue. This is an issue of a bad police officer, and more to the issue, a bad person.
Statistically speaking:
"* Based on survey data from the U.S. Department of Justice, roughly 5,340,000 violent crimes were committed in the United States during 2008. These include simple/aggravated assaults, robberies, sexual assaults, rapes, and murders.[13] [14] [15] Of these, about 436,000 or 8% were committed by offenders visibly armed with a gun.[16]." https://www.justfacts.com/guncontrol.asp
Gun violence makes up about 8% of the violent crime in America. Is that bad? Yes. Is that as bad as people are screaming it is? No.
This case has almost nothing to do with gun laws. There is no realistic way you can disarm the police force in America. It will not happen. There would have to be a full scale removal of guns from the country, and we all can make a pretty good guess as to where an attempt at that would lead.
What happened here is a travesty, but, it is not a gun law issue. This is a case of a bad person abusing the power and tools he had at his disposal. Does it happen? Yes. Is it common? No. I posted before about the number of encounters the police in America have with civilians on a daily basis, and the number of those encounters that ended in some form of violence. It is less than 1% of police encounters that end in violence. And if you look at police brutality, it is far less than 1% of those encounters. This is looking at a pool of over 40 million encounters. That tells me that the police are doing there job pretty effectively, and for the most part, by the book.
Is there anything where there is not outliers? Can you think of anything that you can analyze where there is not something that falls on the outskirts? I can't. And with the numbers backing it, I think the police and gun laws here are actually pretty effective. In fact, most states that have recently added the ability for citizens to conceal carry have noticed a drop in the crime rate. Because an armed victim is not as much a victim.
As for this particular case (to stay on the topic), this guy is a disgrace. He is thankfully being put through the system so he can get the sentence he deserves. From all I can see he made a decision to take a life, and now he will pay for it.