Do you really think there are that many actual startup people here, relative to the commenters as a whole? Also, with few exceptions (myself clearly included), the people here who actually have companies tend to be very positive.
But, it was a good discussion I thought, sometimes conflict can flesh out ideas and make them stronger or make bad ideas more eligible to be discarded. I certainly took a lot away from it.
I actually appreciated the debate, it's something I encourage in my company and helps us get to the good ideas faster.
Multiple failures might put people in a bad mood.