From the sidelines it looked like they were arguing based on system level thinking and you're arguing based on the premise that individual participation of any level makes you fully culpable.
I don't think individual action makes any meaningful difference and that's what's being argued. It seems pretty clear you believe the opposite and at a purely abstract level I guess there's validity to this but at that point I could make an argument that you are just as personally culpable for all injustice in the world for not doing an adventurism as they are for buying a chocolate bar