Yah, I think their idea with implementing it was for threads that are simply 1 question. like "which merit should i get for THF?" etc. they were probably thinking "They can ask a question, get an answer, and close the thread!"
or maybe they were just being really lazy and thought giving us that power would ease their load?
Either way, any positives (which i acknowledge 1 or 2) are far outweighed by the fact 9/10 its generally just abused by OPs who can't take constructive criticism or the fact sometimes topics dont always stay on topic and might deviate and close a thread.
If a topic gets too far out of hand obviously a GM Would close it. Or the posters would get it deleted by the GM staff if they get reported. So we have that safety net.