its not the gov't who _wants_ to crush bitcoins (but they will probably be the one actually implementing the measures). A currency, and the subsequent control of it, will lend lots of priviledges and power over those who control it.
Currently, the central banks (the Feds, and the various EU central banks) control the currency (by control, i mean they are the only ones able to print more of it). Now, i don't really know who controls those banks, but i m willing to bet that they are some powerful vested interests there. These people do not like the gold standard, simply because having a gold standard strips them of their power they currently enjoy.
Bitcoin, being a good candidate for a digital gold standard, will be targetd just like the gold standard was targeted in the 70's in the US of A. I really wish bitcoin could become recognized by the normal peoples of the world, but i think it can't, because there is no force behind it. The monopoly on using violence is the only way to have a currency adopted, and i don't see bitcoin getting any of that. my prediction is that bitcoin will be relegated to being a niche currency.