As a marathoner and coach, I deal with injuries more from my being a total klutz than from the actual training.
You are so right in your underlying message that we absolutely do need to listen to our bodies and that there should be no reason to believe that injury is just par for the course. But, when they do happen, knowing how to treat them will make a huge difference in how quickly and well we heal. Some basic rules of thumb we teach in our training program are:
Looking forward to more from you.