Violent crimes with weapons, specifically guns, are extremely high. I agree that good, responsible gun owners are not the specific people committing these crimes. However, if you are a responsible gun owner, you no that you don't need military-grade weapons to hunt or protect your property; you know you don't need 500-rounds to do that either.
It is irresponsible to argue in favor of keeping dangerous loop-holes in regulations that allow criminals and violent offenders to obtain weapons easier than it is to obtain a driver's license, and I reckon everyone knows this to be true.
Police departments and officers that are fighting oversight of their agencies, which are responsible to public review, are not acting in Good Faith. According to law enforcement investigators, refusing to cooperate is a signal of guilt or wrong-doing.
Police who want to serve their communities would be open to discussing and making changes that would bring their departments in-line with their community's values.
There is also absolutely no need for the militarization of a civilian-domestic police force. It is disturbing to see rural departments that don't have a history of violent crime or terrorism, build up an arsenal similar to what would be needed to stave off an invasion of a foreign army or major active terrorist attack.