The US are only allowed access to the SWIFT criminal database in Europe because Europe got fed up with the US hacking into it.
The US stands accused of unlawfully accessing Airbus commercially sensitive documents and selling them to Boeing, during the Echelon affair.
So, yes, they do believe they can break into any server at any time, for law enforcement purposes or financial gain through unlawful activity. I see no evidence of any serious attempt to keep this within any sort of reason. Indeed, the Manning Files and Snowden Files, together with the John Poindexter/Oliver North scandal and strong implications of CIA drug smuggling, suggest industrial espionage and economic crime are a mainstay of government activity.
I have no objections to espionage for genuine security, but accusations of CIA drug running when combined with the takedown of Silk Road sounds to be much less about anyone's security and much more about protecting market prices. If that is the case, then this isn't law enforcement but white collar crime. Further, Silk Road - whilst certainly a criminal enterprise - was not a matter of national or world security. It was also not a legally recognized context for extra-jurisdictional action.
This was a situation that could have been resolved lawfully and with integrity. The authorities chose neither, which is suggestive of them being incompetent or corrupt. Now, one should never ascribe to malice that which is adequately explained by incompetence, but corruption isn't really malice, it's just a perversion and everyone has at least one of those.