So I’m not inclined to get drug off on some distraction with an easily offended sort over the morally correct phrasing or how one should think, but I’ll put it as this.
1: Abuse comes in many forms, not just physical, focusing the notion of keeping it secret and being difficult to talk about on the one most outwardly visible face of it detracts from the larger battles happening in the emotive and mental abuse space.
2: There is a material difference in physical assault perpetuated by an adult or mature child which has a level of malice and intent behind it and that done by a child which, although I’m speculating since it’s not listed, would have been doing this bare handed and without a properly formed mindset to fully comprehend their own actions. A small child at that age likely weighs somewhere under 60 pounds and has hands of relevant size. At some point a person simply needs to be able to fend for themselves or be considered incapable of dealing with a situation, be that in physically resisting or in correcting the behavior of the kid to begin with.
A teacher shouldn’t have to plan for a kid bringing a gun to class, that’s fully on the parents being negligent, but if you work with kids, particularly young ones that haven’t properly learned control of their emotions yet, it should be expected that you’re going to get kicked in the shins here and again and be capable and prepared to deal with that.