1) The man is an anarchism/zero-government advocate. 2) He was wearing a provocative t-shirt featuring B52s and a slogan "Bitcoin not bombs." 3) He was nervous, difficult and antagonistic throughout the entire security process. 4) His backpack was full of metal lapel pins emblazoned with the Bitcoin logo.
This could be titled instead as: "TSA scrutinises erratic, apparently mentally-unstable anarchism activist to ensure he is not going to blow up a plane." The bitcoin thing is just a red herring, they suspected him and were casting around for different leads to see if they could get something out of him.
Honestly, there's no point in getting so upset and hostile going through airport security. Fixating on how your freedom is being desecrated or something like that is just going to get your back up and make everything worse.