Dude, NOT your fault! You had NO way of knowing this would happen, and I dont know you but I feel like i can safely assume that if you had any idea any of these kids was planning something like this you wouldve done something to stop it. I can understand you feeling guilty, but you didnt cause this outcome. If you were explicitly teaching kids to run away from home then yes.. but my dude, you are teaching priceless skills that these kids are insanely lucky to be learning from someone with the skills and experience you have. I was lucky enough to grow up in the country and was taught the same kind of skills you talked about and i have had to use them on many occasions, id be dead many times over had it not been for people like yourself that cared enough to show us and teach us these skills. Please dont blame yourself? This is not your fault.