But no, I was never dodging bullets. I lived in a Western country and the assailant used other weapons and wasn't part of a paramilitarized group, so I guess it doesn't count.
Which is why is fucking bothers me that you dismiss life for kids in the developed world as an "absence of real problems". Just because we're not scavenging for food, doesn't mean we don't have real problems.
Sure, thankfully many kids won't need that knowledge until they're older, if ever. But it's not always clear who will. My family certainly didn't meet the stereotype.
People are never properly prepared for tragedy. That is the difference between trauma and sadness. No less, these things happen. Trauma lives in the past. When you reflect on these past experiences they can define you or become you. That is the difficult choice you must confront when dwelling on these memories. With effort you can choose to let the pain of past memories go, if willing. The acceptance of such choices is the nature of perseverance.
Conversely, do you have chronic income insecurity? Are you dodging bullets and bombs daily as some people do? Were you ever a victim of child slavery in a third-world nation? I suspect if you have internet access you probably have reliable shelter and don't stress over food insecurity. Those are real problems, and yet the people who live through those stressors typically aren't the ones needing mindfulness. The difference is a matter of perspective from perseverance. The lack of perseverance in normal childhood development is certainly a first-world problem.