I don't know how many of these are really "sacred cows".
Most (if not all) are things which a number of people here would disagree with.
Right off the bat, I personally strongly disagree with 5, 6, 18, 20 (the first one), and mildly disagree with most of the rest (at least in the absolute form they are presented in).
Though I personally would generally agree with 14, 21, 22, and 24, many of the ones I might agree with, other's on the forum have made cases against - and the majority of differences of opinion here have been met with reason and open minds.
All of which brings me to my contribution:
#30: the people on this forum are generally smarter, more rational, more open minded, and most of all more able and willing to look at things differently instead of just doing something a certain way just because "that's the way its done", making us superior to all the consumer sheep still stuck in the matrix.