"I think it's broadly about the male condition. They're both extreme ends of the spectrum. Niall is too shy, too scared, too ashamed and it's stopping him living a full life and becoming the person he wants to be. He could benefit from some of Reuben's assertiveness, self-assuredness and drive. Reuben however needs Niall's sensitivity, thoughtfulness and kindness because he's a violent, selfish, hateful monster. They're currently two halves of a functioning whole. Maybe"
I kind of hate the way that being shy, scared and ashamed are painted as being in the opposite corner of a monster, it almost carries the implication they are as bad as their opposite pole. Nobody will be harmed by young Nialls personality traits, Reuben's damage all those around him. So far we know he has bitten off a man's nose, verbally abused a teacher with misogynistic undertones, got his girlfriend to have sex with a 15 year old Niall while he watches, violently assaulted an admitted despicable bully in his and Nialls class, been extremely rude to Nialls female flatmate, spat on her. There is a hint of possible further nefariousmess in the way the girl he spat on breaks down in class the next day too. Oh, and beat the Asian flatmate to a point where in real life he would almost certainly have died, for no good reason, all the time thoroughly revelling in the violence and the fear. There will be young boys watching this who might think "oh, he looks cool, maybe Im supposed to be like that". No doubt there'll be some deeper delving and reckoning in later episodes with Reubens trauma, but I really cannot escape the bleak thought that the creators actually admire, and want others to admire, the violence, the abuse, the head stamping.