The teachers are people of conviction. Well timed on their parts. Both chose to take a job and make a career at a public school that had union negotiated contracts. Neither took teaching jobs at a private or parochial job fresh out of college most likely because of the starting wage and benefits. It’s much easier to take a tough stand against a union when both have enjoyed what union representation got them rather than quitting their public school jobs and seek teaching and coaching positions at a private, parochial or charter school that typically pay their teachers significantly less and have less attractive healthcare coverage than their current public school employers Are they going to continue to accept and participate in the union negotiated health plans if their districts have a different health coverage for administrators and staff instead of the union negotiated MESSA healthcare package? Have they cashed out of their state employees retirement plan and shiftEd those plans to a independent retirement account? Are either going to accept State of Michigan Employee health care plans that act as Medicare Supplemental coverage when they reach 65? If either were to be fired on the whim of a school board member who cobbles a majority vote is The Mackinac Center for Public Policy going to cover their legal fees for them to return to their job? Both have accepted union negotiated contracts, retirement packages and healthcare. But neither want to quit working at a public school. They like they higher wages and benefits but those union dues.

But I bet those two don't complain about their salary and insurance, which is bargained for by their local unions, while they sit back and watch.

It isn't any different than working for any union shop where you don't like how they spend the union dues on political endorsements you happen to be against. Good for them for speaking out and splitting with the union.