As far as where the line is drawn, I simply follow my gut as to right and wrong. No need for me to write my ethics in stone, each and every situation is unique and said situations require context and personal beliefs pertaining to 'right and wrong'. So without a particular instance that's a hard question not to give a generalized answer to.
Also I don't believe in your sin, so that's a non-sequitur.
Also I don't believe in your sin, so that's a non-sequitur.