I can certainly see how the definition of "scum" could be hijacked
to fit any particular political agenda, too.
For the particular purposes I referred to earlier, the definition
would be:
"Continuing to allow criminal activity to occur within your network."
"Criminal activity" is easily definable by laws which state that
malicious, willful, and concerted attempts to perpetrate financial
theft, fraud, and unauthorized computer tampering are illegal.
But with all the ensuing discussion, it would appear that this
is a matter in which ISPs defer, and a matter best addressed by
law enforcement.
- - ferg