This is all typical liberal touchy-feely stuff that teaches nothing. My step-niece taught this way. She once had a classroom activity where they pretended the be fighting in trenches in WWI. I bet most of her students have no idea when WWI occurred, who was in it, and that there was a WWII 20 years later.
Did she use real mustard gas?
This is like the psych prisoner/guard experiment where they ended up having a “Lord Of The Flies” mentality and really freaking out a lot of people. Children would be much easier to manipulate. Nightmares ahead for a bit but with normality should be okay in a couple of months. If not, it just exacerbated a predisposition.