1. This is a pro, not a con.
2. It was originally designed to combat the inflation the 2008 market crash caused. Dark net markets then started to utilize it due to its inherent privacy features built into it. It was not originally designed for dark net markets.
3. This is due to the fact that there is no enforceable way to stop it. It cannot be stopped until quantum computing advances another 10-20 years... and by then there will be quantum resistant blockchains. There is no way to stop it and this is why it has spread like wildfire.
4. Govts don't ALLOW it. It is something they can never STOP. So they instead go the route of trying to make sure they can collect taxes on it.
5. This is also a pro, not a con.

Some rebuttals to your additional comments.

1. It doesn't strike me as a white OR black hat operation. It strikes me as a NERD operation.

2. Digital currency CREATED by the govt would be a way they can control us... but NOT BITCOIN. No govt has control or any real means of access to anyone who is transacting in Bitcoin.

3. Chip in the body would be ONE OF THE WORST ways to secure a bitcoin wallet. Actually. You want your bitcoin wallet keys located in a completely different location as yourself.

You should research the origins of bitcoin and WHY Satoshi and his team created it to begin with. Also, there is a vast amount of evidence that Hal Finney who is an American Cypherpunk nerd who died shortly after Bitcoin went live... is Satoshi Nakamoto. So that also contradicts the whole NSA theory. There is no connection of Bitcoin with the NSA, not even a smidge.