Uhm ...
Killerdog RDMed Yakuza once. He doesn't have low karma because of a glitch, but because of RDM.
RDMing a person with low karma once is NOT target RDM. If anything, it's regular RDM, and we all know that killing one person is not bannable.
And regarding Nightmare, I don't know. He could have been joking and he has not actually ghosted anything - he just said "lets ghost", which could have also just been a stupid joke.
I don't know, this report doesn't convince me at all.