It shifts the Overton window on what behavior is acceptable, and like the GP said it creates a feedback loop where stores close, prices increase, more people are forced to steal, etc etc. It's pretty widely accepted that lawlessness, even at the "petty" end of the spectrum, is a precursor to larger deterioration of society and whatever civilization/empire you're talking about specifically.
> It's pretty widely accepted that lawlessness, even at the "petty" end of the spectrum, is a precursor to larger deterioration of society and whatever civilization/empire you're talking about specifically.