It usually takes a lot more time to do and a larger inferential distance to bridge. Also the existence of this thread itself encourages and creates positive reinforcement for low quality contrarian ideas.

Edit: Oh are you asking why I criticized a made up idea instead of one in this thread? I didn't want to get dragged into the object level, and I didn't want to seem like I was picking on someone, I just wanted to illustrate why it takes longer to respond to an idea than to generate it. The idea I criticized is similar to comments I've read here and on the Facebook page.