First, any half-decent "hacker" would be able to cover their tracks. Or are going on bad Hollywood movies?
Second, the US and many of those countries are the biggest employers of hackers.
"Def Con" should be renamed "Recruit a hacker", all the US agencies have in they payroll several hackers and I'm sure they are not just advising them on how to defend.
Do we need to remind the US and friends of Echelon/Carnivore?