I think what Omba means is, "Kaori" play is very optimal because Town can't always afford mislynching someone for being an asshole and not playing (or pretending to be) because most games don't allow more than 3 mislynches... and have more than 3 lurkers/scum.
MOTK Meta prefers to lynch people on merit of what they do, not of what they don't do. Scum can win the game by not playing at all, because Townies are naturally averse to lynching people for not playing the game instead of lynching people for being scum. Sadly, MOTK Town thinks not playing the game is actually pretty cool/a viable strategy, and when I say that I'm looking at Schezo (last game), PX (most games), Rawr (most games), Pesco (Angel Beats), Shadoweh (last game), Omba (last game), ActionDan to some extent with V/LA every game multiple times. Probably more that I can't be arsed to remember and thus name, but lurking and coasting isn't exclusively scummy on MOTK.
We can policy lynch people for lurking/coasting, but since it's a Town-favoured strategy employed by some of the players it's tantamount to surrendering Town's major weapon.