Parking off pavement is almost as bad as salt. I've seen more than one car that from the outside looked perfect but it had been parked on gravel or grass for years and the underside was gone, you could inspect the inside of the engine and trans without removing the pans (or what was left of them), the "floor" was nothing more than rotted carpet and subframe rails,,,,,,,,,,,,,,,,,,,,,,,,,,,,,what subframe rails. All because someone parked it next to their garage 10 years ago and made it worse by covering with a blue tarp, just to really trap the moisture in, because they were "going to restore it someday". Sad.
At least your control arm only bent and didn't come apart. Usually the driver senses a problem when on of the front tires is jammed into the wheelwell and the fender is bent back against the door when the control arm becomes two separate pieces.
This is an example of what we see here in north central WI all too often at the shop.