Do you feel upset because Aunt Marge said that Harry should be caned regularly, was mentally subnormal, was rotten inside, etc, but it was when she insulted his parents and ONLY when she insulted his parents that he snapped. This upsets me greatly.
"Voldemort murdered Lily and James? I'LL RAISE YOU, HARRY." "Peter was camping out in your dorm for three years? I'M COMING, HARRY." "Your scar hurt? I'M COMING, HARRY." "Someone put your name in the Goblet of Fire? HOLD ON HARRY, I'M STAYING IN THIS CAVE DON'T WORRY I'LL TAKE CARE OF YOU." "Snape might mistreat you in Occlumency lessons? TAKE THIS MIRROR SO I KNOW WHEN TO BEAT HIM UP." "You're in the Department of Mysteries? I'M COMING, HARRY." And after that, Sirius never came for Harry again.