I also am not sure what to believe... and please forgive me for saying this... but what you see at school isn't always so...

Have you ever been to the actual premises of the staff? Is it possible that this is happening?

You might know the teachers well, but its an embarrassing situation and you know how bullying happens here... they might be to terrified to talk about it...

Please, can you investigate these claims further... if unfounded, then great, although it wasn't very nice of this poster to insinuate what they have... but what if its true? And your childrens teachers lives are in danger in their homes/roooms at night?