Only siths deal in absolutes.
Good and bad are silly and childish terms, a modern military needs the capability to intercept enemy signals, a nation state needs signal intelligence capabilities to facilitate it's own national interests and security.
This doesn't mean that the NSA should capture every email, facebook post and tweet and store it for future use.
But that doesn't mean that a signal intelligence agency running a SIGINT/ELINT missions in direct support of a military activity is inherently bad it isn't anything, it just is, as this is a capability that any modern military complex has to posses.