If you believe that humans are animals, there can be no such thing as the history of humanity, only the lives of particular humans. If we speak of the history of the species at all, it is only to signify the unknowable sum of these lives. As with other animals, some lives are happy, others wretched. None has a meaning that lies beyond itself.
Tragedy is born of myth, not morality. Prometheus and Icarus are tragic heroes. Yet none of the myths in which they appear has anything to do with moral dilemmas. Nor have the greatest Greek tragedies. If Euripides is the most tragic of the Greek playwrights, it is not because he deals with moral conflicts but because he understood that reason cannot be the guide of life.
Anyone who truly wants to escape human solipsism should not seek out empty places. Instead of fleeing to desert, where they will be thrown back into their own thoughts, they will d better to seek out the company of other animals. A zoo is a better window from which to look out of the human world than a monastery.