"Because most of them have no idea just how grim the life of a subsistence peasant farmer is"
You could say the same about oil rig workers or coal miners and they are going to use both coal and oil when they grow up. Should we teach kids how to do these professions too? Where should we stop? There's many "grim" professions, things that need to be done in life, yet school kids are usually shown none of them. So what?