This is one of my personally learned lessons of wisdom that took me far too long to figure out:
"A lot of the time you just need to let people continue to be wrong"
I'm not talking about when you're going in for surgery and your doctor told you he is going to amputate the wrong leg. I'm talking about when someone says something that is factually or morally incorrect. There is an infinite amount of wrong people in the world. You will encounter dozens of them on a daily basis. You would have an opportunity to personally correct quite a few of them. Don't do it. Smile, nod, and walk away.
Lets say you want to correct them and in the best case you're successful. They now know what they said was wrong. Most people really don't like to be corrected, even if they were wrong. They are embarrassed, possibly shamed, and at worst, humiliated. What kind of interaction do you think you're going to have with that person going forward into the future. Do you think they will embrace you as the really intelligent person that took your time to help them out? No. They will think you a pompous, arrogant, know-it-all. And for what? You spent all this time and energy on something you don't even really care about. Your purpose in life is not to be "Defender of the truth, hero of logic" or anything. You're just a regular person, and the guy on the subway does not give two shits that he mispronounced the word "nuclear" as "nucular".
In the professional world its a bit different, but even then, most of the above applies. You have to be careful where and how you correct someone. Even if the ultimate outcome is for the good of the organization, you can alienate those that you need to like you for you to effectively get your job done. You can quickly develop a reputation as an uncooperative "Diva". That is career poison and no matter how good your subject matter expertise, this reputation can forever limit your advancement.
So unless the outcome of something really and truly matters to the outcome pf your life or your job, and sometimes even then....let it go without saying anything. Let them be wrong, and leave them behind you never to be seen by you again in your entire life.
You need to update this map with the rest of North America in the "A hopeless situation, just pray" or the "Nobody wants to be sad all day" categories.