I think it's a stretch to suggest that strong gun rights are what lead to police paranoia. Be reminded that many of the murders or other difficult-to-justify killings that have happened at the hands of police in the past decade have happened in cities where gun rights are essentially non-existent.
Any city in the US where gun rights are essentially non-existent is a few miles away from another city where they can get guns from, and nothing stops the guns from moving back in.
When guns are illegal in the country it becomes a lot more like trying to smuggle drugs over borders. It still happens, but not so casually.
I don't think the legality matters much. Drug prices have across the country have dropped significantly despite a ballooning war on drugs. A quick google search shows that cocaine has dropped 80% in price since the 80's.
http://www.slate.com/articles/news_and_politics/explainer/20...
Maybe somewhere in the world it will have positive effects if minorities are suddenly armed. In other places of the world police suddenly has to assume that everyone could carry a weapon, potentially leading to a lot of the problems the US has with their police. It's certainly not universally positive.