I think there's an extent to which the position that you're promoting as an alternative to the Buddhist position just is the Buddhist position for most Buddhists. There's the sravaka path vs. the bodhisattva path—and the whole Mahayana tradition is about choosing to stay in the world and suffer, rather than embracing final nirvana. I've always conceived this as a sort of rebellion against cosmic injustice and a sort of non-rational but deeply humanistic decision. (Cf. Vimalakirtinirdesa Sutra, Shantideva's Bodhicaryavatara, the Ugrapariprccha Sutra, etc.) Theravada Buddhism may allow one to take the sravaka path and just seek nirvana and an end to suffering but Mahayana Buddhism calls for one to be a bodhisattva, one who chooses to remain in the world, suffer with others, and try to make the world a better place rather than foresake the world in an attempt to end one's own suffering.