I don't know who has -8, do you mind mentioning him?
This one was
an easy guess ![Cheesy](https://bitcointalk.org/Smileys/default/cheesy.gif)
All types of tags? Maybe, but I rarely notice a negative feedback from DT1 or DT2 that has to do with politics. Negative feedback is almost always based on objective criteria, like fraud or lies. In fact, I'd like you to direct me to such examples, as you claim that you're noticing.
Those types of tags have certainly reduced over time as more and more members become inactive. They would mostly be common among long time members of the forum, who in some cases had grudges or simple disagreements with each other and then end up exchange negative feedback, but then you know they haven't scammed anyone. Let me dig up an example
edit: Anduck and SaltySpitoon