Again, No one would want to give such newbie merits knowing that they don't have good intention on forum rather writing in the purpose of scamming people here.
Did I say that you shouldn't ban scammers' accounts? I said that it doesn't make sense. Buying an account to continue scamming is not a problem for such people. Do you think that scammers deliberately grow their accounts to the rank of a hero and only then turn into bad people? In the same way, getting merit for them is equivalent to getting merit for a simple newbie; they will not tell you about their intentions, as you say that you recognize them. However, moderators do not always ban accounts even of those users who violate the rules directly, for example, recent cases of plagiarism. Therefore, the decision will always remain with the moderators, and the tags left by DT will always serve as a warning. People should understand that their safety always depends on them and be cautious, checking not only links but also tags.