Dunccan, my dear boy. While my rhetoric might not be up to par with Magdalene's, I think she makes a hugely valid point. Robbing those that rob is not justice, it is vengeance.
Justice is more on the lines of killing those said criminals for their actions, but not doing it by stooping to their level.
Methinks you might have joined the wrong order all together. I would say Xanthe would be happy with your actions where you in her order.
My two cents,
Written by my hand on the 24th of Leaflost, in the year 1107.