Its fucked up, i know. Ive seen some guy killing everyone next to NCR workbench. No guards did nothing to him, he just kept killing everyone. When i tried to kill him, i got instantly blasted to bits by the guards. Epic a lot, is it?
That has been fixed I believe, there are a few policeman inside now.
Next time hide from guards and then shoot ;pInside workbrench there're no guards, but outside NCR policemans, so just go inside and do the dirty job.