Again, IANAL, but my understanding is that the concept of self-defense is specific to the use of force, rather than broadly applicable. You'll find it difficul

Again, IANAL, but my understanding is that the concept of self-defense is specific to the use of force, rather than broadly applicable. You'll find it difficult to prove an immediate thread of physical harm from a DDoS. And even if it were legal, you'd still have to deal with all of the "$SELF_DEFENDER broke my web site" PR unpleasantness from the innocent bystanders.