Should we add a reason for closing questions that are discussions?

Question

Should we add a reason for closing questions that are discussions, or that try to seek discussion?

"primarily opinion-based" may sometimes not work.

Here's a suggested reason, right from the help center:

You should only ask practical, answerable questions based on actual problems that you face. Chatty, open-ended questions diminish the usefulness of our site and push other questions off the front page.

(thanks @5chdn for idea)

Example:

Ethereum and bullying and possible coersion to delete by third parties

Is a hardfork more democratic then a softfork?

Whatever answer gets posted, the asker will probably discuss in comments (as they've done)...

EDIT:

Another example: Is the DAO incident being investigated by law enforcement?

There are questions that may "trap" answerers into giving an opinion or primarily opinion-based answer. This meta discussion is about how to deal with those questions, because even an "agreeable, logically defendable answer" can still attract debates and further discussions...

Answer 1

I feel that primarily opinion based is already a good answer. If something has no agreeable, logically defendable answer then it's primarily opinion based.