Let's be honest here for a second: This whole forum has a slightly negative influence. A place to scam, a place to spam, a place for everything that is "grey" or simply overlooked. Yes, there are some spots between all that dirt but they are getting smaller. Being labeled all the time, might force people to think first. I know it's not perfect as with all the ongoing personal bitchfights the view is wrecked unless you customize your trust view.
The forum might not be in a great way currently. There's definitely issues, and everyone knows this. But, honestly I don't see the benefit of introducing something which would affect how users perceive one another in sections which are irrelevant to trust.
I'm not a fan personally. I can see your frustration, but I don't think this is the way to go about it.