If we can use the tagging system properly, there would be no complains, DT's misusing the trust system leads to misleading forum members as that trust is visible.
DT system isn't limited to DT, we all are responsible for choosing DT-1, thus DT-2. With our votes, DT get selected. So, if we all user the trust list system properly, no incapable DT will be selected.
Anyway, I also think that negative tag for this reason isn't appropriate. Hhampuz is giving them a warning because in Livecoin thread it's not possible to warn them, they are deleting the response. Hhampuz also admitted to remove the tag.