I do agree with you that those posts doesn't deserve any merit at all but like I said them getting a negative feedback will depend if the DT members wil be agreeing on your side. But in my point of view the evidence is simply lacking that only one or two time he have merited the user cannot simply convince or deemed substantial for any DT member here. If they sent several merit transactions to the same user and have sent some back to them then this might be a more convincing situation. I know that you want them all to be tagged but my advise is wait for them to slip a little bit more and gather more evidence against them to make your case more convincing to DT members.