It seems to me as if sometimes, people polarize themselves in discussions having to do with pets, I guess because they are so passionate about their opinions and maybe that is human nature. For instance, many people are either for or against pit bulls. Or for or against spaying/neutering.
Sometimes (as happened to me recently) someone says something in a way that is calm, different, and made as an observation, that evokes a change in the way I see a particular issue.
If a post is adversarial it begets argument, but sometimes, a person will refreshingly write a well thought out observation without drawing generalizations or taking a stand, and such posts are the kind that make me think.