the other reasons believe are because we were made as people, the image of God, with free will, creativity, etc. secondly because the angels were created before God madeeverything, they saw Him make everything, and had no excuse to rebel and think created beings could overpower God. for most of us our sin natures are there simply because we’re born to sinful parents, and it’s not anything based on anything we’ve yet done. so mankind gets salvation if they receive it in the proper context.
I believe all of that plays into it. I’m not sure we can know all the reasons at this point. In heaven we’ll be able to ask the big questions, and get the truth from the source.