OK, I just saw the badge of shame "in action". It actually looks kinda cute. Maybe too cute and people will be proud to collect them

I like it attached to the offending message. I guess I wrongly assumed that by "attaching it to the user" you meant replacing their avatar or something so the user would be brandished for the whole forum.
This is much clearer to the offender than the bombs where often 5 people were misbehaving and it wasn't clear who actually deserved the bombs and as a result no one seemed to feel the bombs were meant for them.