I haven't noticed anybody (that doesn't mean nobody else is doing it) other than Doug .38 starting this sort of thread.
I read his scenarios as meaning only what the words on the screen are. I don't try to interpret what he's thinking. I haven't yet gotten the impression that he's out to shoot somebody, so I post responses when I think I have something to say.
I do notice that some posts that RESPOND to him seem like they're coming from people looking for an excuse.
When I respond, I say what I think I'd do. Who knows what I would ACTUALLY do. There are too many variables to predict that.
Since responding to the scenarios makes me think about them, I think they're useful. I try to respond using what I know about how various things work. It's a good mental exercise that's better done now than during an incident. Best of all, since I don't want to appear to be an idiot, I will often check the applicable statutes or other basis for my responses before I respond and learn something new in the process.
I tend to give responses that give attention to the law's requirements. I also tend to point out that sometimes the gun isn't the best solution to the scenario, and I've seen others do the same. Maybe Doug and others posing these scenarios just need to see what the range of possible responses is to help them do the right thing. I got no problem with that. Maybe they just want the entertainment of seeing the responses that come back. I got no problem with that, either.
Since we're on the general subject, there's a really good website (IMHO) that anybody who's truly interested in self-defense should look at.
www.nononseseselfdefense.com
The owner of that site does not discuss firearms at all. He talks at length about the guy who's going to be on the other end of your gun the day you have to use it, and how that guy thinks. A theme that permeates his site is that training in the martial arts can get you in more trouble than they get you out of. I have no opinion on that, but if you can mentally filter that out the site has really good information, and lots of it.