Ah the Epicurean paradox.

The argument that God should all prevent evil from existing is not well founded. Biblical scripture in fact explicitly states the opposite.

Isa 45:7 - I form the light, and create darkness; I make peace, and create evil;I am the LORD, that doeth all these things.

Our understanding of evil is quite limited we suffer yes but we don't necessarily see the larger picture. For every evil act, there is a possible benevolent act that can undo its harm (if only the technology or wisdom was available).

The promise of such overarching benevolence is fundamental to Christianity which states that our evils have been paid for by another and that all wrongs will eventually be made right. The world to come in Judaism is a near identical belief if it less detailed on how said future comes to be.

Now perhaps you dismiss this ideal as fantasy. Regardless, it seems clear enough to me that the outlines of such a future could eventually be manifested into reality by any intelligent species including our own with sufficient faith, time, technology and determination. Indeed the very worship of God seems destined to bring it into existence.