Write a letter to someone who wants to do something unusual or socially unacceptable

Just strongly suggest that it isn't right to do something and maybe think of the consequences and what they get out of it

Hello friend,

I am writing this letter to you because i have heard that you want to do something that is unusual or socially unacceptable. Know this that you have to live in this society with the same people. The world is harsh and does not forgive anyone.

Be careful what you decide to do with your life. You should be vary that what you do, should not have you regret later in life.

I hope you understand the complexity of this situation.

Yours truly,

XYZ