They are all blinded by the idealistic nature of the currency for the libertarian/ancap utopia they think it's going to usher in. /r/bitcoin is, as a whole, very naive. A lot of those people are heavily invested in a speculation game for the first time in their lives, and have seen massive gains, and I believe most of them are just riding that wave that "this is it. this is really it!" They say they just want a currency, but they are never more excited than massive price swings in the up, and never more depressed and suicidal then when there's a massive downswing. They stay positive because they want everyone else to stay positive and keep investing, because that makes their coins worth more. I also find it hilarious that they are all slowly realizing why regulation of a currency is a good thing as they keep getting hit with all these shady companies, but they will never admit it.