In any case though, I think what I mostly object to isn’t the claim that if you endorse Vasco’s reasoning because you are a utilitarian that counts as “naive”, but rather the use of the “naive utilitarian” label to imply that his reasoning:
a) is distinctively utilitarian rather than being compatible with a variety of moral views
b) commits you to being prepared to use violence/deception.
In any case though, I think what I mostly object to isn’t the claim that if you endorse Vasco’s reasoning because you are a utilitarian that counts as “naive”, but rather the use of the “naive utilitarian” label to imply that his reasoning:
a) is distinctively utilitarian rather than being compatible with a variety of moral views
b) commits you to being prepared to use violence/deception.
I would probably agree with that, but I was responding to your criteria above, in which case I think it meets your “Naive utilitarian” citeria.