I appreciate sometimes it can look like that, and I’m sure some teachers don’t need much persuasion, much like plenty of other people in plenty of other professions.
But you have to realise, children are dirty. Schools are dirty. Most teachers have colds of some sort 80% or so of the year! Teachers were always going to have to self isolate when the symptoms to do that can be caused by a simple cold.
Anyway it’s all irrelevant now, schools will be shut by Friday.