I know why people crash drones.
1.They run into stuff. Always fly higher than everything else should be the plan.
2. They run out of battery. Always return with plenty of battery should be the plan.
3. They fly the full sized drones inside when only toys should be flown indoors .
4. They lose control because they choose to disregard and over ride all the built in fail safes. Keep gps on and stay in line of sight if drone.
5. They don't use a pre flight checklist and stick to it. Don't make exceptions and stick to the checklist. Like if seeing if the solar activity monitor shows all is clear or not. If all is quiet with the geomagnetic field, then okay to fly. Yet if beautiful day and there is a geomagnetic storm, should choose to stay grounded.