This was a really common repair we did in fleet. We got to where we could Notice ones that were slightly bent. We would stock one in the parts room. If a person is at a junkyard wondering what else they could grab for $2 that might be worth a spare, start examining them and you’ll be able to judge which are not bending already.
The material used isn’t the strongest and is amplified by technique of opening the door we figured out. People that use right hand to pull handle and left hand or arm to push open the door never have them bend or brake. But many drivers (myself included) would push out with the left elbow while left fingertips pull out on handle. As the door opens the use of the arm as a lever to swing the door open maxes out the handle throw and applies pressure while the handle is pulled out causing alot more stress on it.
But it usually take about 150,000 miles worth of one person doing this to cause it.