I first became a vegetarian when I was nine in response to an argument made by a radical babysitter. My great change - which lasted a couple of weeks - was based on the very simple instinct that it's wrong to kill animals for food.
We've made science experiments of ourselves and our children.
You do have to change things as warfare changes.
Twenty years ago I was living in a lovely cottage on the edge of Dartmoor but I couldn't afford to run a car.