It is odd that the now-anointed “mom of the year” is a woman videotaped beating her son, and rather violently at that. That’s the Ethics Incompleteness Principle for you: even conduct that is “always” unethical may be made ethical by unusual circumstances. Seeing your grown son participating in looting and rioting that are destroying your neighborhood changes the rules, or perhaps makes them inapplicable.
Here is what the unidentified woman (UPDATE: Her name is Toya Graham) was doing that is an ethical duty: she was fixing the problem to the extent she could. Utilitarian? Yup. Would Kant approve? Well, if every mother of those rioters intervened, they would have had more success than the Baltimore police did.
As for the Golden Rule, her conduct passes that test as well. If I were getting pulled into violent, mindless mob violence like that kid, I would want my caring parents to stop me by any means short of shooting me. If it were my son wearing that hood, I’d be tackling him.
I don’t know if she’s really “Mom of the Year”—I’d like to think that a really exemplary mother won’t raise a rioter. She’s an Ethics Hero, though, beyond question.