I have dropped a gun once, and barely overcame the urge to catch it.
When I was younger, while quartering an orange with a Chicago Cutlery knife, I dropped the orange. On pure reflex, I caught it. Knife was still in the orange. Slashed up my left thumb pretty nicely.
Point being, reflex often kicks in and has us do things we would not do, if given a moment to reflect. Thinking about the problem ahead of time can help pre-condition against reflex.
That said, I have been shooting for thirty years or so, including military training; yet I don't think an instructor ever mentioned not catching a dropped gun until fairly recently.
I still think too many people want to make crimes of what more reasonable people would use as teachable moments.