Address the issue of people questioning the authenticity of someone's letter and express your opinion on why people do so.
I hate when people think letters are fake. This means they overestimate the intelligence, common sense and morals of the masses. Are you saying that it's impossible for a middle aged man to lust after a teen girl, and that it's impossible for a woman to kiss her friend's husband on the lips? What planet are you from, dear? On THIS planet, people the world over do stupid things, gripe about petty things and act like perverts. Spend a little more time on Planet Earth and you'll see what I mean. I'd love to visit YOUR planet, which obviously is filled with smart, sensible, highly moral beings, but unfortunately, I have no way of getting there. But we welcome you to stick around on Earth to learn more about its stupid and corrupt people.