Belz...
Fiend God
If a child can't toughen up and learn not to be hurt, he/she is weaker than one who can. Tough/weak are pretty normal antonyms, and the psychological outcomes of weaker children are pretty well known. I was just restating what you said. If it's not what you meant, feel free to clarify.
If purely factual language seems jarring in this context, well, that's why purely factual language can also, strangely enough, be classed as an appeal to emotion and shaming.
More appeals to emotion. I told you: all this is wasted on me.
Either make a reasoned argument or admit that you don't have one.