[Amy Jade]

I thought the gas station attendants role was pretty clear (no shade) he had come to some kind of agreement with the cannibals to send people in their direction to trap them in return for money and belongings from the victims.

I think his suicide was out of guilt from sending the Carter's to their demise.

In the original the gas station attendant is related to the cannibals and is the father to the leader (Papa Jupiter) he tries to hang himself but fails and is killed by them.