I think what the parent poster is getting at is that many of us are bewildered at the way you are using the word “safe”.

I take it you aren’t saying that students believe that an assailant will be hiding in the classroom with a bat ready to assault them as the enter the classroom.

Rather I take you and others to be using safe to mean something like comfortable. But unsafe and uncomfortable are two different words. There’s rarely or never good cause to make someone feel unsafe, but sometimes being uncomfortable can lead to growth. Or at least people used to believe so.