I do not know what these people doing on bitcointalk forum if they did not believe in crypto future, especially these people which saying that Bitcoin will go to zero.
A lot of them are trolls, though I'm not sure why you'd have an account on bitcointalk if you really didn't believe there was anything to bitcoin. My guess is that at least some of them are bitter about losing money at some point, and they're trying to spread the misery as far and wide as they can.
I doubt these people know what Bitcointalk is. Most of the ones that commented under that article were typical people who work over 8 hours a day, drive home for another hour, eat dinner, grab a drink, and watch a movie in bed. They don't even have time to troll the forums at home. Most of them read news and write comments from work. They get frustrated reading about some kid becoming a millionaire by investing in some fake Internet money, while they have to write reports for 10 bucks an hour. Life sucks if you can't think outside the box.
Some people still don't understand this, but as far as the world needing bitcoin, I can see their point. Right now I don't think we do, but if there came a time when fiat money suffered a severe crash, it'd come in pretty damn handy. It's also useful for online anonymous transactions.
Some countries need it more than others. If I were a citizen of Venezuela, China, or North Korea, all I would think of is getting my money out of the country and cutting myself free from the decisions of my government (at least financially because they can still arrest me). If your government is checking how much money you're carrying at the airport and puts restrictions on bank transfers, it should be a brutal wake up call for you. A sign that you might will cryptocurrencies sooner than you think.
P.S For those who thought that I'm talking about Bitcointalk, or Reddit here, I wasn't. These were the comments on a local news site, the one where you rarely get comments from people looking for a way to put their money to work. The average Joe still thinks that Bitcoin is fake money, a scheme, drug money, or a bubble, and even though he knows that it has potential, he's too scared to invest. He'll never make money because he'll prefer a 3% savings account that he doesn't have to worry about.
We are the 1% ladies and gentlemen