To make that claim, you do need to first establish that he would accept a bet of 15 lives vs some reward in the first place, which I think is what he is claiming he would not do. There’s a difference between making a bet and reneging, and not accepting the bet. If you would not commit murder to save a million lives in the first place, then the refusal is for a different reason than just the fact that the stakes are raised.
To make that claim, you do need to first establish that he would accept a bet of 15 lives vs some reward in the first place, which I think is what he is claiming he would not do. There’s a difference between making a bet and reneging, and not accepting the bet. If you would not commit murder to save a million lives in the first place, then the refusal is for a different reason than just the fact that the stakes are raised.