some of the topics are locked because they were posted strictly to provide information. had members been able to add comments, that information would have gotten lost and forgotten because so many people don't take the time to read through a topic before they add their two cents. those topics are locked to prevent them being taken off-track.
the topics that are not locked are there so members can posts comments, questions, pictures, as appropriate to each of those particular topics.
there is no need for confusion or controversy.
a bit of patience would be very helpful, though.