Someone you love may make a bad choice. Don't judge them. Comfort them.
Plato said that it's easy to forgive children who are afraid of the dark, but it is a real tragedy when adults are afraid of the light. The light is truth; adults who ignore the truth, or deny the truth, are destined to make the same mistakes over and over. Don't hide from reality; see the truth, embrace it and move forward.
Don't risk your reputation. While it would be great if we could be anonymous after work, the reality is that sometimes we will bump into customers, colleagues or clients in the most unlikely of places.