I can tu quoque right back at you; can you conceive of a person who expresses some opinion (and this includes technical matters, things within the scope of your job, opinions you are being paid to have, not just random political things) only and solely because it is their real opinion? No, if you came at with me with my own opinion two weeks later, you would not find I have radically shifted very often, and even less often without realizing I've shifted, and virtually never insulting whoever held the opinion I held two weeks ago.

I don't base my opinions on whether or not I get to contradict someone else. Clearly some people do.