Yes there is a possibility of trading merit here but before an action would be required, then the evidence needs to be irrefutable that anyone would see and agree with not casting any doubt. Just like @actmyname has made a position, if he should go ahead and tag without a conclusive evidence, then that would amount to giving credence to threads about abuse of trust by DT members. In my case, I saw a post and I was impressed wanted to give 2 merits but didn't know it was 20merits which is irreversible. It was when I was reading the thread again that I saw myself gave someone 20 merits that I had to go back and check if I really did that.