Cinefactus dixit:
This accusative case is not due to the
melius. Generally, the following rule holds:
Suppose that an infinitive acting as subject is accompanied by a noun or an adjective that would be in the nominative of predicate if the verb were finite. Then the noun (or adjective) assumes the accusative case. This is the case with the infinitives of the verbs that govern double nominative, including
esse.
Dīligī et
cārum esse jūcundum est. Cic.
Rūdem esse omnīnō in poētīs inertissimae segnitiae est. Cic.
Cōnsulem fierī valdē ūtile Mariō vidēbātur. Cic.
Magnīs in laudibus tōta fere fuit Italia
victōrem Olympiae
citārī. Nep.
Impūnē quae libet facere id est
rēgem esse. Sall.