u/Dababybuckethat

I am a first year philosophy student that needs to write an 1500 word essay. The essay im writing has the thesis: the basic argument proves that ultimate moral responsibility is impossible. I am using the paper "the impossibility of moral responsibility" by Galen Strawson. For my essay, I want to refute the fact that the basic argument could be seen as metaphysical megalomania. Does anyone have a good source for my refutation? (or any tips in general?)