Do you honestly believe that, in today's world, those things couldn't be built/services be offered without government involvement?
I believe it is possible for those things to be built/offered without government involvement.
It's just that historical evidence shows that doesn't work worth a damn for many things.
It's not impossible, but it's unlikely to ever succeed or become fully efficient.
Let's find out. People are making your argument not about decentralised government, but about bitcoin. "It'll never work" they say. But we know it already does (at a "small" scale...)
And think about this: what if you like the idea of of local, people-run government right now? Where can you go to get it? Look, and you'll see that there isn't anywhere. There's alot of people out there that want the opportunity to choose to go all local. But basically every corner of the earth is "owned" by a government, and none of those governments are happy to give these people what they want. And this is democracy? Where the people rule? The US is supposed to be based on the local government "by the people, for the people" model. And look where they are now.
You might say the people voted for what they got. But if you asked people after the fact, they'll tell you they "didn't think it was going to be like this". So, you can say you're against cutting health and education spending, and in favour of stopping all spending on wars and corporate subsidies. But what power have you really got to make that happen? The power to vote for a new face who promises you "no more of the same", only to end up giving you more of the same after their time is up. The excuse is usually some variation of "real life got in the way". These professional politicians do the minimum to help the people they can get away with, then use everything else for themselves and their business interests. And that pattern is showing no signs of ending, and the scale of what the politicians get away with is starting to go beyond disgusting.
Bitcoin is just one way to take power back from the government. Bittorrent is a similar way of taking content distribution back from the corporate media. The internet itself was a way of giving anyone a platform to broadcast to the world. But they're not giving up without a fight, as you may have noticed. Internet freedom is under threat, I don't need to say anything to convince you of that. The crafty stealing from the public's pockets is a serious threat to the public, right in the middle of an economic recession, which the politicians and their banker buddies allowed to happen so they could get, that's right, more power and more money.
So you can carry on paying these protection rackets to let them "look after everyone" if you like, not going to try and stop you. But there's alot of people out there that have had enough, and want out.