Well, obviously RPGs don't teach everyone involved with them to think effectively. Some people just develop the reflex of tossing out monty python reffs.
In all seriousness, I'm thinking of a SF setting where a character is in fact arrested and imprisoned without trial for making RPGs, because the government really doesn't want any hobbies or habits encouraged that promote actual thought instead of mindless compliance, indulgence, etc. Like modern american media does.
The idea of a state that subtley, or perhaps not all that subtley, discourages intelligence and complex thought, and uses mindrotting "entertainment" (Reality shows, professional wrestling, etc) to pacify the intellect while portraying people involved in intellectual activities as undesirable in various ways is a kind of subtle horror story, not to mention good social commentary on the current world as well.
Gamers would likely be persecuted to various degrees in such a world, much as "intellectuals" have been decried and targeted in various oppressive regimes.
This could be an interesting game world.