The Good Place goes under the premise that four people died and are in the afterlife. In different seasons it is hinted or explicitly said that everything in The Good Place as a place is:
actually the Bad Place.
However ... Maybe The Good Place (or The Bad Place) are not Places, but rather states of spirit. Each of the characters go through spiritual/moral changes (even growth!). Can a spirit's afterlife depend on their intelligence? Nothing should indicate in that path. Can a spiritual character move forward or backwards (or sideways) depending on their actions and frame of mind/heart? This is likely, and even indicated during the story. Hence, the chance that Places are not places, but rather frames of spirit/heart.
If anything, a simple spirit such as Jason is like a happy-go-lucky golden retriever. There may not be much reason to think that because of being stupid should be a reason to go to the Bad Place. Jason is basically a simple and happy person that sometimes makes mistakes out of ignorance, not much bad intent, somewhat childish and searching the world when he steals (and dies in a safe) or ruins the tires of opposing dance crew.
Heaven/Hell as state of spirit is hinted by the mystic Emanuel Swedenborg. In this author's view, Heaven or Hell are not places where you go after dead but rather the continuation of the way you act, feel and sense in a general spiritual way of dealing with the universe. In this manner, the spirit stays in the state with which it feels best at: good spirits feel at ease in heaven whilst not at ease in the counterpart dimension; and bad spirits by the same opposite coin. So transitions between places are infrequent, but not impossible.
Michael, the person in charge of the four humans, on a occasion explains to Jason [S02E02 Dance Dance Resolution] what the current place is. Even so, after some conversation, Jason concludes, in the scenario of a gorgeous garden: "I give good advice. Guess that's why I'm in the good place".