Bullshit. Again:
Exodus 7:3-5
"But I will harden Pharaoh’s heart, and though I multiply My signs and wonders in Egypt, he will not listen to you. Then I will lay My hand on Egypt and with mighty acts of judgment I will bring out My divisions, My people the Israelites. And the Egyptians will know that I am the Lord when I stretch out My hand against Egypt and bring the Israelites out of it."
So killing the Egyptian firstborns wasn't evil? YHWH made the Pharaoh stubborn, to force him to release the Israelites, YHWH killed all the firstborn males in Egypt not protected by the Passover blood. YHWH set it up so the Pharaoh will fail, and the collateral damage are the firstborn guys. That ain't evil?
Simple. Religions tend to tell the Deity's qualities (omnipotent, omniscient and all that shit). Then the Deity's wants. Basically He can solve this or prevent this, otherwise His qualities are a lie. But these shit does happen. Done by His "chosen," even. God can create the universe but can't stop a man? Bullshit.