Of course JollyGood, as far as I've seen, acted honest, and showed some disgust and intolerance for scammers, which most normal human beings should have been raised so. It's definitely a bit eccentric and out of line in this forum, but stop complaining, you know, some people are honest and don't like promoting scams.
When scam is proven, act there a no problem. Everyone of us act to a proven scam. If anyone speaks in favor of proven scam there is problem but you should not leave red tag for something that has not happened yet. Your tag damage the business. A red tag sent wrongly damage the motivation of a member who wanted to have a pleasant journey in the community.
I think it largely depends on the situation and personal judgment. It is not a good idea to always wait until a scam happens to warn the community. If there are obvious red flags and valid reasons, I think it is okay for DT members to put a red tag on the account as a warning. Every single tag can be easily removed or changed to neutral. I have followed many cases in which JollyGood was involved and I mostly agree with his/her decision, but of course, everyone should make their own conclusion based on the available evidence and not blindly trust the opinion of other members.
If there's one thing I've learned over the time I've been involved in the crypto, it's that you can never be too careful or to do too much due diligence.