Completely agree. It is absurd that a scammer can have a Legendary rank. This could be easily avoided by implementing "negative merits".
Maybe those "negative merits" could be given only by legendary rank or something like that, in order to avoid spam or something similar (like bcash-reddit-spammers

).
There is such a thing it is the negative trust given out. So if you are dealing with somebody check their trust rating and also look into untrusted feedback, check the reference. Take untrusted with a grain of salt though as it can often be retaliatory.
Sorry for the Off-topic.