He's particularly frustrated because he was a potential target. The fbi wants to know everything, but there are details they have to withhold and things they just don't know.
As they comb through ever facet of this kid's life and come up with more questions than answers, while crying to experts to analyze it... the simple answer is also true. He just wanted to make a huge statement and be remembered. Political affiliation had little to do with anything.
Furthermore....
Now the black community is pissed that Republicans care more about this shit show than blatant murder of black women in their homes by white cops. Nvm the other issues surrounding this.
And obviously having people in their sight means that there are certain individuals that are currently being monitored and not just followed, but digitally observed.
No wonder people like Snowden and assange rustle their jimmies.