For reference, here's an actual case of financial loss incurred as a result of this scam: https://bitcointalk.org/index.php?topic=2835521.0 (No doubt there are many more; this is just the first one I found.)
I'd gladly risk a blacklist over this, but the problem is that nobody is allowed to support it without risking blacklisting themselves. The system actually de-incentivizes supporting any accusations, which makes no sense.