"Right. But don't people also have an opinion of their own? Or... Aren't they interested in developing one?"
I think the responding members have developed their own opinion on this and chose not to discuss it further and carry on.

Just because someone chose to *accept* a response and go with it (while in agreement or not), does not mean to say that they don't have their own opinion, but possibly are picking their battles for the moment. Accepting John's response is making what they want of the issue.
It doesn't mean to say they don't have opinions of their own, or are afraid to express them. I've seen many expressions of opinion on this thread. It's more about choice and acceptance I think.
KD