How critique can do damage? Isn't that the thing you do to improve things?
You say what is bad in order for someone to acknowledge his/her errors and do better as a person. Fact.
Damage? Yeah, personal. People are generally stupid and don't like being touched for the mistakes they've made, so... that I can understand (Oh boy, the ban's I got for that... countless) but general damage? Nah... can't belive.
What 'damage' did you say you've done?