If a DT member tags anyone for wrong reasons and refuses to reverse it, there is no way to remove the person from DT.
Of course there is. Enough DT exclude him to the point where they lose their DT power. That's exactly what happened to Timelord the other week.
If theymos for instance should create a poll to determine who leaves the DT, you will be shocked by the result of the poll.
Would never happen because all the busted alt accounts who wanted to manipulate the poll for their own reasons would fire up their sockpuppets and rig the vote. For example, in 2019
theymos blacklisted 58 accounts from participating in the trust system, all operated by a single person attempting to get their revenge on someone.
If the system is failing, the consequence will be too many tags on people's profile and random ~ of users without reasons.
Not at all. The consequence of a failing system would be more scammers running around undetected.