I'll bet plenty of folks here have done stupid things as well.
You're right and I do not suggest the start of a new thread w/ that title either!
Many years ago (probably 1976) when I was a field sergeant for a large mid-western city police department, I responded w/ other officers to a tavern disturbance call. As I walked by one parked patrol car, I noticed that the shotgun was in the rack but the rack was not locked nor was the car. I secured the shotgun in my own car trunk and went inside the bar to observe the officers. After the call, I went on my way and listened as the other two officers got back in service.
I "trailed" my errant officer for over two hours as I did not want the occasion to arise where he would need the shotgun and not have it. After the two hours, he called me on the radio and asked if I would meet him at the station. When I responded, he looked like he was going to cry as he told me the story of how he had left the rack and car unlocked and his Remington 870 (and 4 rounds of 00 buck) were missing.
I retrieved his shotgun from my car trunk, handed it to him along w/ the loose shells, and drove off. Other officers told me later that he wanted to meet me at the station as he was going to resign to avoid me having to do all the paperwork.
That officer was promoted to sergeant in 1980, captain in 1988, and major in 1999. I retired in 1996 and this officer retired in 2003 and I was invited to his retirement party.
I'll give you one guess the subject of his first comment in his little "see ya" speech!
Everyone makes mistakes and some of these have consequences, some of which cannot ever be fixed. Sure, it was serious and I could easily have made the case for termination. As it turned out, he was a valuable asset to the PD for nearly 30 years. I'm sure he had the same attitude when he was a field sergeant, too.
My dad used to say that "that's why they put erasers on pencils."