I've had the same question myself in the past
From what I understand, it all has to do with why GOd made us. The TL;DR is He created us to share in a mutual relationship with beings like Him (made in His image) and thus having their own will, like Him. The bad has to exist because of the Fall of Man, due to man's free will choice to sin. God isn't going to reverse the free will actions man made, because that would invalidate man's free will entirely, meaning man wouldn't actually be made in God's image. God thus works through willing followers to bring about the salvation of mankind through His son Jesus Christ, to bring about that none of the lost sheep shall perish, but all have eternal life. Like refining gold or silver in a furnace. The impurities are burned away, leaving a pure final product. The Fall added the imprutiy.
There's alot more detail to it, but that's the most condensed explanation I can give to that exceptoinally expansive question.
Believe me, the truth is hopeful, in spite of all the doom and gloom. Might not seem like it, because of all the trauma programming, but there is a way out of this nightmare.
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