Jassi: Well, it all depends. Prudence and a calm head should allow you to determine the right course of action in any given situation.
Jissei: Attack, of course. Defending implies that you don't have sufficient power to take the enemy down, whether that power comes in the form of magical might, brute force, political influence, psychological sway, moral conviction or plain intestinal fortitude. And if you don't have that power then, by all means, feel free to sit idly by. All the better to make room for those who don't lack the will and capability.
“…Judge not what a man has done, but judge what he could have done if he was a different bloke altogether. For art thou a leper? And a leper can changeth his spots…” --Rudy Wade, Misfits (Series 4, Episode 8)