Not chase after the drunk.
I've taken drunk drivers keys from them at stores before. You want to talk about a pissed off drunk. Wow! Pretty much had to sit on them til the cops got there. One guy left the keys in his running truck and the other guy I took them out of his hand. If not I would have taken them right out of their pockets. Both of them I watched pull up and I really don't know how they were able to even drive there let alone walk after.
I witnessed one at a city park get taken down til the cops showed up. That one I stayed out of because the gang of kids he almost ran down not only took his keys but beat the **** out of him.
Did I have the right to take their property? Legally? Didn't care. Probably not but I'll be damned if I'm going to let some dumb**** kill or injure someone else while knowing I could have stopped them. The cops didn't mind at all.
Looking at this guys actions, depending on how drunk he was, I wouldn't have just got the plate number, I also wouldn't have let him back in his car. I don't care how wrong that sounds.
If any of you are acting drunk and you pull up in front of me drunk, you will be de-keyed, taken down, whatever I can do to keep you from driving away. You could press charges, put me in jail, try to pull your gun. I DON'T CARE!
I make it my business. I've had way too many people I care about killed by *******s that think they are just fine to drink and drive. I have to get involved.
Oh-
And to answer your comments? I DON'T CARE!
While he wasn't criminally charged for his actions (a decision I agree with), you're probably right on that. A call to the police with his vehicle and personal description along with the direction of travel would probably have been my choice. Granted, its easy to armchair the situation from here but I do know my nature.
As for the concerns that the idiot may have gone to his vehicle to grab a weapon, you're absolutely right. That's a possibility. However, if that were to be the case, I'd rather deal with it from within the building than in the open.
I have a lot of experience with drunks. I have worked for many.
I know that they are immune to reason, are angry and, horrifically, sometimes the only way to control them is to shoot them.
Don't go stepping in someone else's dog crap. You are not Batman, call the cops.