Why is this a red herring? Because you say so?
American teachers in the public school system are badly paid compared to any other first world country.
School boards are unwilling to offer reasonable financial compensation to teachers, so collective bargaining tries to take whatever other form of compensation they can get, which is often job security.
If America were really interested in good schools, it would offer teachers better compensation in exchange for more accountability.
The other part is that the number of deadbeat teachers is extremely low. I’m sure you have plenty of anecdotes regarding individuals, but by the numbers, the vast majority of teachers are trying to do a good job with the very limited resources at their command.
You are so interested in punishing a tiny number of bad teachers that you don’t care about the collateral damage on the vast majority of competent teachers and their students. For shame.