I consider myself a bitcoin enthusiast, and I have never made any of those arguments, and I don't consider myself to have "lost." If the value of bitcoin goes to zero and stays there, I don't consider myself to have "lost." It's still an awesome idea that interests me from computer science and economic/political perspectives, and everything we've seen happen in the bitcoin economy is to me a cool proof of concept.
I don't understand why the "anti-bitcoin fanatics" are so vehement in their criticism of bitcoin enthusiasts. You seem to deriving much more excitement from the recent bitcoin price drops than I ever did from its price increases. Honestly, I just think the decentralized transaction log based on proof-of-work is a really cool idea, and the hypothesis that there could be a trustworthy means of making and verifying transactions without a government or central authority controlling the thing being transacted is compelling. I would think that even if I just read the white paper and there had never been a single bitcoin transaction in real life. The fact that there is a high-profile bitcoin economy is just icing on the cake.
The anti-bitcoin fanatics have carefully constructed their position to ensure that they can interpret literally any event as evidence that bitcoin is stupid or doomed or a scam. Is the price rising? That's obviously market irrationality and pure speculation. Is the price falling? That's clearly the market correcting itself. Is a certain exchange doing well and gaining a good reputation? That's an evil monopoly that goes against the decentralized goal of bitcoin. Is a certain exchange experience technical difficulties? Then that's just a bunch of incompetent amateurs, or worse, malicious scammers trying to distort the market. Is there a lack of people actually buying useful things with bitcoin? That's clear evidence that there is no real bitcoin economy. Is a business supporting bitcoin payments? Well that's still crap, since they're tying the price to the USD exchange price, or using credit cards, or the business owner is just some bitcoin shill, etc.