I respectfully suggest that an argument based on a particular verse in a particular English translation – in this case, the King James Version – isn’t necessarily conclusive. The word “evil” isn’t present in that verse in other English translations, scil:
Isaiah 45:7 (New King James Version):
I form the light and create darkness, I make peace and create calamity; I, the LORD, do all these things.
Isaiah 45:7 (New International Version):
I form the light and create darkness, I bring prosperity and create disaster; I, the LORD, do all these things.
Isaiah 45:7 (New Century Version):
I made the light and the darkness. I bring peace, and I cause troubles. I, the LORD, do all these things.
Isaiah 45:7 (New Living Translation):
I create the light and make the darkness. I send good times and bad times. I, the LORD, am the one who does these things.
Isaiah 45:7 (New American Bible on the United States Conference of Catholic Bishops website):
I form the light, and create the darkness, I make well–being and create woe; I, the LORD, do all these things.
Scripturally,
Mick