Nearly 40 years ago at Christmas-time in SoFla, a crazy old man got angry with me over a parking space at a Publix grocery store, and after I parked he approached my car and put a handgun into my car window on the passenger side where my girlfriend was seated and asked me how I would like it if "I blew your @$%ing head off and put you away, punk."
I promise you I was not brave. I kept my mouth closed and did not say one damn word.
He put the gun back in his windbreaker and calmly walked into Publix. But I couldn't stop thinking what if some old lady with 12 items got in front of him at the 10 item express line and he blew her away. So I called 9/11, gave them my name and number, and took my girlfriend to her home. The police called me a couple of days later and said they found him in Publix with the gun and arrested him.
Turns out he was a retired NYC cop who did NOT have a CCW permit in Florida, and he lied to the judge about it. Oops. He had a terrible temper, and his wife was so fed up that she made him sit in jail a few days over New Year's before she bailed him out. I was called to testify and his lawyers deposed me. But he pled out and was given a suspended sentence, ordered to surrender all firearms, and ordered to psychiatric treatment. AFAIK, he never killed anyone. And I never regretted what I did.