Is this a recent decision? I was just there within the last six months and was stopped everyday while taking walks. Yes, I know exactly how bad it is there...born and raised there and father is retired Detroit LEO. Just curious if you don't mind the question...is Detroit where you were raised and your preferred choice to serve or a federal assignment?
No this is not a recent decision, open carry has been legal in Michigan since each Hawaiian Island was their own royal kingdom. The police just don't like it because their unions fought shall-issue tooth and nail and now they can't believe open carry is legal since people are not afraid to do so and record and report any intimidation (i.e. Port Huron in June of 2010).
Open carry became pretty big in Michigan because when the shall-issue law passed, they put places off limits; however, none of those places off limits apply to pistols carried openly.
The State Police put out MULTIPLE updates over the years regarding open carry and the latest known as State Police update 86.
Even if it was a recent decision, ignorance of the law is not an excuse and plenty of gun owners have had their lives ruined over not knowing all 20,000+ gun laws. The least the police could do is actually know and abide by the law that they are paid to enforce.
Michigan Open Carry has reached out to law enforcement agencies for years now and they all know. Especially this cop in this video, the town he is employed by had their city council chambers packed with people open carrying pistols a few years ago.
A lot of these guys complain that they record them, but the truth is that if cops actually followed the law and did what they are paid to do, then they wouldn't be recorded because they wouldn't be hassling and intimidating OC'ers.
People in Michigan do not cooperate with police on open carry because of years of bad faith efforts on numerous police departments. It's pretty discouraging when someone hands their ID to the officer to "cooperate" and a week later they receive a misdemeanor disorderly conduct court summons in the mail, (this actually happened).
There was a bill last year to repeal places off limits for concealed carry but the governor vetoed the bill, so not more people open carry in schools and other Pistol Free Zones (apply to concealed handguns only).