I steal everything I need all the time from anyone and my karma is still *savior of the waste*.
So yeah, dont even sweat it.
Word.
I am confused by the whole karma/stealing system anyways. Some enemies you MUST kill but still get penalized for looting their lair...very arbitrary. Cass hated me (for what I Have read was based on my stealing as I had been playing as a good guy for NCR, etc). Also, I tend to steal regardless of consequence but it doesn't always reflect in my general status (might appear benevolent when hated by various factions).
I think the rep/karma system was very rushed and didn't have a lot of consideration.
My favorite mixed karma moment...
Sitting next to the informant in the ultra-luxe sauna...one bench is red, one bench is green...suggesting some type of karmatic segregation.
BETHESDA!!! Fine tune this non sense! There is no reason I shouldn't be able to loot from any hostile faction without consequence...you arbitrarily let me loot from some areas in a given faction but not others.
The same is true for stealthy kills...I am maxed out on sneak. I sandmanned Jack in his cot in Nellis with no one around only to exit outside to be attacked by the Boomers. I couldn't have been more discrete!