Several reasons.
1) The banned posters were not banned for starting threads they didn't care about the answers to, the were banned for disagreeing with the LC status quo.
2) Those who banned were often banned simply because they came from JREF.
3) We don't mind asking legitimite questions, but when you put up a post when you already are pretty certain about the answer without any indication that you think you know the answer, that's pretty trollish. Then to make such a stupid comment about glass not being reflective when falling means you really just want the thread to explode for your own personal satisfaction.