I think it's just a combination of saying how if you were killed, lynch one of two people. that's what I didn't like. as shown, you were wrong on one of them. You'd be leading them down the wrong path as I am certain town would have followed your dying wish. Your scum reads are not more important than 15 or so town members. And the town would have followed you. I'd suggest not doing that again, as from the looks of it either mafia killed MM to frame you, making you town, or they did that to frame you, making that fact make you look town, but you're actually mafia - double bluffing, but in either case, master mew died most likely because you put the suspicion on him. I apologise if I'm wrong here, but still. Let others give opinions, you've already led a three person bandwagon today. Some people are likely to follow the lead of anyone who knows how to lead, which you do, but I think you need to cool that down just a little because we need contributions from more people, and not just you.
Easier time, that's why they're better. Not everyone is willing to put in maximal effort and scum hunt so much that their vanilla role will be as useful as a cop. Maybe you could, but a lot wouldn't. A lot of cops will sit in the back finding out alignments, then as a vanilla role this person may also sit back too and follow bandwagons, because they don't want to lead. In this case, cop is better.