This link goes to an article, with photos, regarding an individual who had an accident entering his car with a holstered striker-fire pistol. Fortunately, there was no serious injury.
The article points out that leather softens – loses rigidity – with use, and it was this soft leather that substituted for a finger inside the trigger guard of the pistol.
The point is all equipment, pistols, holsters, belts and ammunition should be periodically checked for wear and function.
Criminal Law instructor Don Brown taught us never to assume. Being demure in the classroom environment, he said it makes one of these out of you and me. (pointing to the first syllable of assume).
Don’t assume your equipment is always in working order, not worn or broken, and properly lubricated, just because you’ve not dragged it across a parking lot. Check it.