[COLOR=DimGray][FONT=Palatino Linotype]You essentially have two options. You can rend their flesh, but you'll depreciate your integrity for it. Or, you can avoid them and do nothing, but preserve your purity.
If you're looking to be as good a person as you can be, you can't compromise. Violence is violence, and that's not your domain. A breach now, and it could lead to further breaches in the future -- and ultimately, you sink to becoming exactly like they are. Purity demands completeness.
Or, if that's not your game, you can simply destroy them by whatever means you deem fit. You do, after all, have the will to power -- all of us do. You have a drive in you to fulfill it, and it's your option to pursue that. If you do, you have an advantage -- keep in mind what Sun Tzu said: "Simulated disorder postulates perfect discipline, simulated fear postulates courage; simulated weakness postulates strength." Keep in mind, though, the warning above.
Ultimately, it is your path to take. I give no advice on to which option is preferable, but one is inevitable.[/FONT][/COLOR]