It's not my work to search and show evidences
If you don't have 'evidences' then don't make wildly incorrect assumptions based on incorrect hunches. It serves no purpose unless you have evidence. Would it be fair for me to accuse you of being a scammer or farming accounts with poor posts without evidence? Of course not.
Well, as far as I can tell, CoinFriend was pointing out the account farming going on, where did he associate it with QS? With respect to whether it's fair to accuse someone of being a scammer without evidence, that's exactly what Quickseller has done to me. As far as I can tell there have been zero repercussions for him. Not saying it's right, just saying that it seems to happen around here without consequence.
about 2) The account "Quickseller" made only decent posts, that right. But that doesn't mean the person behind Quickseller post in the same way from other accounts.
Well he did with the ones I was aware of (both ones he told me about ones he didn't). I don't think he's going to risk having his main account and all his others banned.