The only way to keep players from doing something stupid is to Just Keep Talking.
Sadly, there is no way to keep the DM from doing something stupid, although offing one of his favorite NPCs might shut him up for a couple of minutes.
This Game is Too Videogame-y
What's wrong with a game being "too videogameish"?
The Biggest Game Ever
Just how big IS No Man's Sky? What if you made a map of all of its landmass? How big would it be?
Even allegedly smart people can make life-changing blunders that seem very, very obvious in retrospect.
The Loot Lottery
What makes the gameplay of Borderlands so addictive for some, and what does that have to do with slot machines?
The Brilliance of Mass Effect
What is "Domino Worldbuilding" and how did it help to make Mass Effect one of the most interesting settings in modern RPGs?