Concealed carry in Michigan schools is legal in only two ways.
1) you have a PFZ exemption on your license, currently only available to law enforcement personnel.
2) you do not exit your vehicle, and this only applies to dropping off or picking up. Also covers legally transported long guns.
Unlawful CC on school property is not only illegal at the state level, but also at the federal level. In a PM I received, the question was raised as to whether the open carry exemption met the federal criteria as licensed carry as it pertains to the Federal Gun Free School Zone Act, since it technically is not licensed open carry. To my knowledge, the exemption does meet the criteria at the federal level, else the feds would have intervened and prosecuted at this point.
I've openly carried a firearm in different schools, in different districts and in different counties. While I do live in a more rural area, we are surrounded by major metro areas. It does still raise a few eyebrows, and people have asked if it's legal, but I've typically found that a calm, rational, patient explanation goes a long way. Most people I find are not as rigid in their opinion, even one based in ignorance of the law. Those who are tend to be Chicagoland transplants, and tend to avoid locals during their stay.
I'd prefer to see the laws change, but like the case in Texas, sometimes you gotta start a fire to get things moving. I'd much prefer to CC where ever I go, even if it does mean advanced training, additional fees, and whatever other loopholes that need jumping through. But, in the absence of options, I do what I need to do. Same as I did prior to getting my CPL, when open carry was my only option, though it meant disarming prior to entering a vehicle, adhering to PFZs, and other annoyances. I'd love to see the law change, in favor of personal liberty, though, not against.
As for the strict adherence to personal opinion despite the facts, well, you can lead a horse to water but you can't make him drink. You can lead a man to knowledge but you can't make him think.
I see this going no further and being constructive. Lets put this one to bed before it gets ugly. Not much else can be said that hasn't already been said, and no further whipping is gonna get this horse moving.