Presumably there is a discussion between the OP and mods before a
thread is closed. I would have thought that 'I'm bored with it now'
is not a sufficient reason but 'It's gone way away from my original
concept due to mischief on the behalf of certain members' is fair
enough, or 'I can see that the direction it is now taking is causing
unnecessary offence to some members' is another.
At the same time, members other than an OP who has his/her thread
closed are more than free to start a new thread on the same subject
if they feel the discussion has legs. If they believe there are posts
within the original thread that are pertinent to the discussion they
could link to the closed thread.
I would be against members having the ability to close a thread without
refering to a moderator. Can this be done at the moment? If so I was
not aware of that and in seven years have never felt the need to have
a thread of mine closed. Moderators have