I think there are four categories that we need to think of. It hearkens back to your earlier question. I think the lowest level is the propaganda level, which is equivalent to graffiti on the wall, taking down a website, or something like that. Then you have subversion, sabotage, and attack. Attack is really the only time when it might need a threshold of force.
I think these four different levels, the three below attack.... As a government and as a state, we haven't really thought about the implications with regard to how we might retaliate, who gets to retaliate, and who gets to decide when, where, and under what conditions. Who's involved in that retaliation? Do we allow a private sector to retaliate? Is it solely a state responsibility? And we can clearly define, or fairly clearly define, the boundaries between the propaganda, the subversion, and the sabotage piece.