Quote Originally Posted by Ouch! View Post
The most glaring example of all: (SPOILER)why is anyone afraid of falling into Limbo if all you have to do to get out is kill yourself again? It's how they got out the first time with the train, and it's how they (presumably) get out in the end. If you can just die in Limbo, what's the problem?
The reason why Limbo is so dangerous is that once you're in Limbo (the deepest part of the subconscious that anyone can go) you start to lose your understanding of real vs. subconscious. Meaning that people can get lost in Limbo and spend decades in there and eventually come to accept Limbo as reality.

They made this really clear in the film, I dunno how it can be considered a plot hole!