“Those who have not accepted His grace would be instantly destroyed in His presence... that’s the purpose of the grace, that we might live.
Sinful/evil humans can’t live in the presence of God anymore than darkness can remain in the presence of light.”
But why did he make things that way?
He’s all powerful, he could have made all of us good and respectful of him, no?
You seem to be asking why he created us with free will and the short answer is because He chose to make a creation that could also choose. That whole "in his image" thing.
And we chose to make things this way. That's on us, not Him.