No you should not spam other peoples thread just because you think they are scammers. You as someone that is trying to trade here will have to get used to this however. No one will mark someone as scammer just because you say so. If you have proof or reasonable arguments this might be different, but currently all I see is: he said, she said and Im not going to get involved.

Edit: you can create a "self moderated thread" and remove such criticism, but I would not suggest it as its a bad sign.