The only reason why you would want them to know is because you want them to believe it and invest their fiat, but if you need to get all those brainless followers to spend money then you must have some doubts. You need them because you want them to start the pump that doesn't want to start by itself.
BTC is great, but pushing it on fairs won't make it succeed. People can't be made to understand and like it!
Well, everyone here has some level of incentive to promote Bitcoin, and that on various grounds. I agree that he in certain aspects tend to become a bit too optimistic, but nothing even close to the clown John McAfee is. On top of that, if no one did some actual effort to push Bitcoin on the level he is doing it, the word of Bitcoin wouldn't be reached by as many people as currently is the case. He definitely has some right of speaking by entering the market back in the early days, where he also bought 30,000 BTC from the silkroad auctions. It's an investor, a believer, an enthusiast, just as much as we are -- the only difference between him and the rest of the people is the wealth being involved, but that shouldn't be a problem. Differences have always been there.