Mainstream Orthodoxy

Over at HaEmtza, Rav Maryles, when forced to defend why he deems something religiously unacceptable, will invariably respondthat mainstream orthodoxy is against it. Well, that is tantamount to using a word to define itself, a well known no-no. Reb Harry defines mainstream Orthodoxy as - the type of Yiddishkeit that he, RHM, holds from. So using something's nonconformance to his Yiddishkeit as a "reason" it's wrong, is obviously circular logic. What I'm saying is so elementary to someone who passed (even with a C) Logic 101 or Talmud 101, that  it's almost embarrassing to have to articulate. And yet, here we are ...