I make plenty of comments for which I expect negative karma. It's not too hard to shield unpopular views in language that will soften the karma hit, but sometimes it's better to state things plainly.

I tend to share your philosophy. It is also not too hard to offset karma costs by making a few extra posts.

Interestingly, I am often surprised when posts that I am expecting to be a karma sacrifice turn out not to be. As you suggest, extra time phrasing potentially unpopular views probably makes some difference. Even stating things plainly can be done elegantly.