Is there no conceivable human action so atrocious, so unspeakably evil, that God would actually intervene?

uming for the sake of argument that a god exists, he has watched but remained silent and inevident through many thousands of years of war, , m murder on a prodigious scale, agonising torture, unspeakable acts against the most innocent of children, burnings, dismemberment... an unimaginable catalogue of human suffering... so I was wondering, is there anything at all which would make him step in and say "enough is enough"? What scarcely conceivable horror would have to occur (or be about to occur) before he would come out of hiding and do something about it?