The Sith code doesn't lay out anything about needing to murder everyone and be a bad guy. It just proposes that passion is a source of strength and strength is a means to freedom. What a person does with that is up to him.
You ask how the Sith establishment would react to Darth SolkaTruesilver helping the sick and poor? They might be mad, but if your passion gives you the strength to kick all their asses, then I guess they will just have to accept the fact that you are going to do it because they can't stop you.
To me, the Sith we know and love are sort of like the Objectivists of the Star Wars universe. They took a nice Jeffersonian ideal of individual freedom and corrupted it into "Who can be the biggest *******?"
But its all about Pride and self-centerness. Sith are obsessed about the fear they impose on the mundane, and obsessed about their superiority. Worse, they literally force anyone in their ranks to think the exact same.
They are slaves to each other. The only way you can escape it is turning all other Siths into your own slaves so they respect your choices. Thats hardly freedom.
Real freedom would be letting all siths do as they please. And only have conflict when two agendas are in opposition. Letd say the Noble Sith wants to help poors and sicks. But Evilz Sith wants them suffering as to be an easy target for conquest/recruitment fodder. Then there would be a conflict.
But the Siths as presented in KOTOR are prideful and arrogant. They obsess over their image, instead of actually espousing their philosophy. They fall short of their own ides.
No action should ever be alien to a Sith's mind. Or considered abhorrent. If someone WANTS to be pacifist, who the hell are you to tell him otherwise just 'cause you feel like it?