If they really though this they would not pay any attention to Bitcoin. Its because they believe it can take off that they are so obsessed.
Don't be silly - some people just really like to be right on the internet, and that's why they'll repeatedly post things they're convinced is truth. I'm the exact same way about things I'm interested in.
They're convinced Bitcoin will fail, and they shout it from the rooftops because when it inevitably (to them) does, they want everyone to know they called it.
Thinking about it a bit more, I think their biggest problem is that it's a clusterfuck of yes-men. The amount of peer pressure and regurgitation of each others ideas pretty much guarantees that everyone will be on the same page, wishing for the same thing (downfall of whatever they feel like laughing about), and I doubt any amount of education will make a difference.
This was the exact criticism I had of them months ago regarding Bitcoin. Many of the exact flaws they can point out in the Bitcoin community (because this forum in particular is one giant echo chamber of yes-men, if ever there were one) can be attributed to them as well. There are some really braindead, pants-on-head retarded folks here - but you'd have to be deluded to think that any sizable community doesn't have it's fair share of village idiots.
SA's issue is that they think the only idiots in their group are the Bitcoin supporters.