Why is that the case? Here are a couple of potential reasons:
Worn Out Ladders
Old, worn out ladders or non-sturdy ladders often cause ladder accidents. It is time to retire these ladders before someonege gets hurt. Ladders have come a long way in the last 40 years and there is no reason to keep using a ladder that has reached its time for retirement.
Climbing on the top cap, leaning on the ladder, using the ladder on uneven ground are all unsafe ways to use your t ladder. Often, when people get injured while using a ladder, they ere using it unsafely.
Climb safely so you can return home safely to your family.