I believe in leave no trace, I believe in it without a doubt. Pack it in pack it out, save your hashtags for your social media. This is about the closest I get to social media. Now with all that said, I will make my actual point.
1. Whoever wrote it was wrong, but with anything like this, there are only two things you can do. Educate the people who did it, and fix the problem. If you do anything more than that, you've become part of the problem and not part of the solution. As someone who teaches on a fairly regular basis, I can tell you one thing. You can try this experiment on anyone and it will show you virtually the same results. If someone doesn't know something, just start yelling at them, scream at them and tell them how dumb they are, and see if they figure out anything. Probably won't happen, probably run in circles and just end up saying forget it.
2. While most online threats are from nothing more than keyboard warriors. There are the few out there who will take it too far. So if you're willing to stand by, watch a group of like minded people create a mob mentality, and and threaten someone. Whether you fee like it's an actual threat or not, it's not your words so you don't know. If something did happen to this person, you essentially would be in the same group as them. You're standing in the crowd yelling lynch him. So what if you didn't pull the trigger.
3. Common sense isn't common. Just the same as keyboard warriors and the people who will sit here and bash you, are some of, notice I said some of, the same people who don't have the audacity to say something to you in person. They will let you commit your mistake and bash you to an entire community.
How about we come together as a community of overlanders, off roaders, and explorers. How about we encourage people to do the right thing, stop the people we see from doing dumb stuff, and leave every place we go better than we found it.