They're surprisingly clever, to arrest after DefCon. Typical stupid USA LEOs would arrest ASAP, so the unjust detention could be a cause célèbre hyped up by half the talks.
Obviously I won't condone everything they do, and internal corruption remains an issue (as we've seen with Bitcoin..), but US LE - at least at the federal level - is certainly not stupid. They have a level of strategic, tactical and technical intelligence that is objectively pretty impressive especially compared to where they were at, say, 20 years ago WRT computer security. That said, it certainly doesn't hurt that some of the highest-profile criminal "masterminds" of the past 3-5 years have had fairly sloppy opsec.
