No, but you try spamming jabs at his face over 30 times straight without your morals breaking. I can't do it, it's wrong- but I don't like getting hit either. I read that combat sports pros can't hold back in sparring, and I get it now. They only care about improving themselves and honing what they've learnt. That sounds ideal, but when another person comes into the equation it gets complicated.
It's a barrier, but I purposely don't cross it, 'cause it's bad to lose yourself to negative thoughts.