This is a jet black, absurdist comedy that works surprisingly well.
I would say that 'deeply traumatised man' would be a more accurate than 'rogue'. For varying reasons Aaron Monaghan's character is an outsider. Some reasons are personal and traumatic, some are public and enormously petty. Either way he's not in a good place. When the first thing you do when returning to your home town is buy some rope to hang yourself with, it says something. It also says something that the shop keeper gives sensible suicidal advice.
The black comedy tone is continued with a throwaway gag about child abuse and a serious discussion about the best way to maim someone. This is not a film to be approached lightly, but in my opinion it is one that works.
A surreal, deadpan, stylised gem.