Well, my getting philiosophical does not necessarily correlate with an uncomfortable level of caring about what I post, so you should feel safe.
To answer your question (since you seem to care that people answer the questions that you pose to them on the internet), I do not necessarily care about what other people say to me if they are not empowered to evaluate me. However, when people post messages to each other for over four years, and you have developed friendships with some of them, then yes, you start to care about what you say and what they say.
So, I would say that the level of caring about a particular interaction is variable, just as it is in any other aspect of daily life. So your dismissal of people caring at all about how people evaluate their posts is short-sighted and exclusive of what I perceive to be the vast majority of participants on this board.