It is escalating.
It certainly is. It would certainly help if the proofs would be collected in a post (e.g. in scam accu) and refered to in the rating. If evidence is strong enough this would also remove most of the bickering and drama.
It would also help if those accused would not hijack several other threads in an attempt to make them look an even bigger fool.
I don't think presenting a lot of evidence that someone is a scammer (or an alt of a scammer) would stop the bickering and drama. It would just give scammers additional information as to how they are caught and what to do to avoid detection. Even when evidence is provided that is solid, scammers still deny the allegations, take a look at what was quoted here (or look at reply #8 in the archive). I think as long as people like quickseller and tomatocage maintain their reputation by being in possession of evidence of a scam prior to leaving negative trust, and removing negative trust when additional information comes to light, posting a scam accusation is really not necessary IMO. Scammers are going to do anything they can to try to intimidate others into removing negative trust (see the number of death threats made by KoS as an example).
The intimidation and trolling does work against a lot of people. For example, look at how much tspacepilot trolls those who left him negative trust (both TF and quickseller), look at how many people have left him negative trust, and then look at how many people have excluded them from their trust network. You can make your own conclusions.
It should also be noted that the OP was not asking for proof to be presented, he was asking that negative trust either be removed or that the quickseller account be removed from DefaultTrust (network)