WHAT THE HELL?
This offends the comic nerd in me and the educator/childcare provider in me. I have worked with kids fairly regularly since I was 14. I have always let them rough house. So what if they get hurt? Then they learn not to do things they shouldn't do, or even later on in life when they get hurt they know how to properly react to it.
Also, the term "overactive imagination" makes me want to punch people in the face