The opinion you
entertain so completely that you functionally
believe it while you express it, no matter the
possibility that you will express-and, to an extent, believe-an opposite opinion later.
John was telling Kate to "just accept that women in
video games have huge breasts because
that's what sells and we should let the free market function as it will". But that appears to have been a stanislavski opinion, because
two days later he was arguing that the writers for Star Wars should focus on it's "real fans" rather then diversifying the cast "Just to sell to a larger audience".