This is based on opinion. Please don't list it on a work's trope example list.
Tear Jerker / Proven Guilty
Although Charity Carpenter has, up to this point, really been nothing but a Grade-A bitch to Harrynote For reasons that you soon find are actually pretty understandable, if still a little unfair on Harry., when he tells her how he'd deduced that her daughter Molly has inherited her magical talent, and has been using black magic on her friends, she reacts with complete and total terror, as even though Molly's intentions were pure, any use of black magic is an instant and automatic death sentence in the White Council's eyes. In that moment you really do feel for her. Also, though no one ever says it out loud, the White Council's stance on Black Magic is worse than ruthless: it's "correct", albeit a "little bit" - yes, only a little bit- overblown. So Charity's daughter is twisting herself into a psychopath, solely because no one ever told her what mind magic does to people. If Charity had told Michael or her children about her magic, this would never have happened. Imagine how Charity must feel.