As teachers, they are criminals.
Why? I could see if they were showing it to the kids in school but this was on their own time. Do the teachers have a history of pushing this nonsense on their kids? The article didn't say.
If you side with the school on this matter, then anything a teacher does in their private life, including posts on social media can be grounds for dismissal. This means a public school can dismiss a teacher for posting conservative memes.
In this case, the cure is worse than the disease