Ok, I think I've understood you. You were the first to tag them and you gave them the tag thinking they could desist from further promoting 1xbit but to no avail. Later on other neg tags visited them. It's all good, now we have confirmed they are truly promoting the scam company, maybe you could change the "trying to" to "promoting " or It's not even necessary because there are piles of other tags in their profile.
Trust ratings cannot be edited; they can only be removed and new ones created. But I do not think that is necessary, because he explained his reasoning at the time well enough.
