Remmick is a metaphor for assimilation, like the protagonists he is part of a diaspora from an culture obliterated by colonial rule. Unlike the protagonists the Irish and other white settlers were afforded the opportunity to assimilate into white America at the cost of their individual ethnic cultures. This emptiness is what leads to the fetishization and desire to appropriate other cultures which remain distinct due to not being afforded the same opportunity to assimilate. The movie explicitly mentions the Filí, a type of Irish bard that played an equivalent role to Sammie in using music to connect people to their shared cultural history. The reason Remmick is so focused on getting Sammie to join his literal hive mind is that he is so desperate to feel that shared culture and ancestral connection that he doesnt care that it isnt his culture or his ancestors.
Ironically, as an Irish person, the scene that I resonated with the most was Sammie's song. I thought it was the perfect visualisation of how folk music can allow a culture to survive and connect with their ancestral pasts even when they have been long forgotten. Irish trad music and contemporary music that evolves from it is one of the very few unbroken threads to our shared past remaining.
Children are far more likely to be killed by rubber and plastic bullets because of their height. Of the 17 people killed by them in Northern Ireland 8 of them were children, plastic bullets alone seriously wounded 615 people from 1988-98 in NI.