Wow, teach heresy for almost 20 years after Humanae vitae, like Charlie Curran did from a perch at a pontifical university, and you're OK.  Undermine Church teaching, like the late Tony Kosnik did as seminary dean in Orchard Lake, Michigan, for five years, and it's OK.  Bishops challenge those guys, and the academics will be fired up about "intellectual freedom" and the dissidents about "conscience."  But question whether what is being pushed actually comports with Church teaching, and the "dialogue driven" smiling, back-slapping, baby-kissing episkopoi will cut your head off fast.