In all honesty, if other workers haven't stood up for themselves or don't have the unions to do it, then that's not the problem of teachers to solve.
I would absolutely stand in solidarity with any other profession that went on strike or took action short of a strike right now. But I can't make them do it- and presumably their workers don't feel that unsafe because they are not doing it.
Or maybe everyone will start using the NEU draft letter, adapted to their own circumstances?
At the end of the day, I can't make things safer for supermarket workers or nurses, as much as I might want to- but I can make them safer for the families of the students I teach.