SOPA is not a solely political affair; it has substantive intersections with the technology industry. Paul Graham simply talks as if he sees the economic / technological outcome of SOPA so clearly that anyone else who think otherwise either has contradictory interests or is ignorant.

I'm not commenting on whether Paul Graham is accurate or inaccurate, modest or arrogant, but I'm not surprised that someone of his position holds strong views on his pet predictors.