I didn't down vote you and I do agree with most of what you've said regarding competition (I suspect the rest of HN also agrees). What you didn't address thoug

I didn't down vote you and I do agree with most of what you've said regarding competition (I suspect the rest of HN also agrees). What you didn't address though is Marco's past relationship with the founders. Specifically he says that he advised the founders, promoted Readability on his website and even created a white-labeled Instapaper version of Readability. Now they've created a direct competitor to Marco's app. This is generating the sentiment.