1. Bitcoin is backed by raw energy and that's a good thing.
2. Any government that bans Bitcoin would in effect be saying 'it works', think about it. That would be great for Bitcoin and what it's trying to do. Plus, very dangerous for any government to ban it if most of the others don't. Can you imagine the laughing heard around the world if the Land of the Free bans Bitcoin and makes it un-free?
Governments therefore have to work with Bitcoin, not so much the coin per se, rather the technology that can be built on it. This is why tech visionaries like Marc Andreessen are investing hundreds of millions in the new digital economy which Bitcoin will help drive. A simple rule in life should be don't bet against Marc Andreessen when it comes to the future of tech.
Also, your arguments are old and worn out. We've heard them all 10,001 times before and for years now. In effect they're like a scratched record or a parrot.
By all means be negative towards Bitcoin but at least come up with some new and novel critiques. But there's a paradox to coming up with new negative ideas - you'll have to do some serious study into Bitcoin which will take at least several months. Do that work, and you're almost certain to become a buyer of Bitcoin...