at what point does this projection of judicial power against individuals in the name of safety (whose safety? whats really at stake here even?) become terrorism?
Become terrorism? To answer that we'll first need to define "terrorism".
There are over 109 different definitions of terrorism. It is not only individual agencies within the same governmental apparatus that cannot agree on a single definition of terrorism. Experts and other long-established scholars in the field are equally incapable of reaching a consensus.