Defcon used to be about naughty hackers (often in trouble). There was a pseudo political agenda.
Looking through speaker list, one sees how most of those doing the speaking and leading of opinion are very much part of the US military-influenced mainstream. That is, we are dealing with folks who are fully indoctrinated.
As a sideline hobby, they hack (for fun, as hobbyists). This seems little more than folks learning techie tools and then showing off technical knowhow.
What you don’t hear is any subversive tone (or even any rebelliousness, even). There is very little dissent from the mainstream.