As you said near the end of your post, you don't know if he followed you from the pharmacy to rob you.
To work from the premise of
If I Monday morning quarterback this, it could be that this guy was just going to get out and use his flashlight to look at the side of his truck, possibly he thought you hit him?roadrunner4man wrote:I came so close to shooting a young man armed with a flashlight
It also could be that he was going to use his flashlight in a very bad manner, and bludgeon you to death with it.
From the information you had, possible road rage, driving yelling and giving you the finger, my guess is he was coming out of his car with bad intentions and that you felt fear for your life, especially when he reaches under his seat for something. If you had been a cop and he did that, he probably would have been shot, or least tazed if the cop were close enough.
While I can certainly understand your thought of not carrying a gun for years after this event, it could totally be that you having your weapon with you, saved your life or severe bodily harm. This is something that you will never know for sure, but I would say having it with you, is much better than not having it.
I hope this event does not make you second guess a scenario just like this in the future, to the point where you should have drawn and you don't.