I disagree. The stated issue for Liberty was not following KYC and AML thereby allowing money laundering. My personal opinion is the ATM heist funds allegedly being routed through Liberty was a stake through the heart. That was a big deal for the banks and for government's ability to manage the system. 

This could easily happen if Ripple gateways and exchanges fail to comply with these regulations and "hot" money moves through the system. Of course, the same could be said for bitcoin or any other crypto-currency's exchanges or gateways, so I don't think the issue is Ripple specific.

You can't be a regulator if you can't regulate and I don't see the US in particular but really any government in general not wanting to control their currency and keep out competitors. There was actually a decent length discussion of how this plays out at a recent meet-up I went to. I don't think it's at all obvious that any crypto-currency avoids regulation at the crypto/fiat interface. Others do...