Peace is a lie, there is only passion.
Through passion, I gain strength.
Through strength, I gain power.
Through power, I gain victory.
Through victory, my chains are broken.
The Force shall free me.
This basically states that the sith only seek power through the Force. The poor and downtrodden are, by this code, merely a tool to gain this. It's like taking the safety off a gun. By doing so, you gain power. With that power, you can end or save lives and determine the fate of others. The Jedi have it, but keep the safety on it, only taking it off to deal with the issues that only a weapon can. The Sith removed the safety entirely and use it to dominate those they deem weaker than themselves or to remove those they believe would challenge that power.