Do: tilde the shit out of them and make a strong case for others to follow.
Don't: red-trust for disagreements.

Come on, it's not rocket surgery. There are 100 users in DT1 but in most cases you need only like 5 or 10 to make a difference. Yahoo is +14 so 8 flips would do it. I haven't heard anything to convince me to flip yet so don't count on me. From what I've seen he put a lot of effort to clean that campaign up, including removal of the X10 signature, so I still trust his judgement.

Nor would I red-trust anyone for carrying the Yobit signature. It's safe to assume that most campaign participants are just being unmitigated lemmings, like iluvbitcoins helpfully showed us.