I like you. I tend towards pyrhonism (or maybe I don't!) so I appreciate that response.
Degree of proof is a relative: Maybe a terror organisation use PIA, NSA go fishing for evidence PIA has nothing. Terror org assassinate NSA head. PIA could be a front, but NSA head had to be willing to lose his life to hide the fakery, and terror org wasn't a big enough fish ... more likely you're currently in a coma. Lots of places for false premises to creep in.
Dial it back, is there a point where there'd ever be enough evidence?
[1]https://en.wikipedia.org/wiki/Burden_of_proof_(philosophy)#P... [2] https://en.wikipedia.org/wiki/Evidence_of_absence