I address this question often and have heard many answers.
Part of the reason for all the answers is the fact: you can take any commandment given in the Bible and say :”This is man’s objective” and have Biblical support to prove it, so “believe in the one who sent me”, “trust and obey”, “Make disciples”, “glorify God”, “accept Christ” and so on can all be shown with scripture to be “man’s objective”.
If I asked you: “Is there an overriding command which all other commands at subordinate to” what would you say?
All departments in any organization needs a brief mission statement subordinate to the Corporate statement, but what is man’s Mission Statement?
Could man’s mission statement be simply: “Love God, and secondly others, with all your heart soul, mind, and energy”?
The problem in fulfilling that Mission is the fact that an unbelievable huge Love (Godly type Love) is required.
The objective is not to never ever sin, but to obtain this Godly type Love is the first of man’s objective.
There are just something even an all-powerful Creator cannot do (there are things impossible to do), the big inability for us is to be created with instinctive (programmed) Godly type Love, since Godly type Love is not instinctive. Godly type love has to be the result of a free will decision by the being, to make it the person’s Love apart from God. In other words: If the Love was in a human from the human’s creation it would be a robotic type love and not a Godly type Love. Also if God “forces” this Love on a person (Kind a like a shotgun wedding with God holding the shotgun) it would not be “loving” on God’s part and the love forced on the person would not be Godly type love. This Love has to be the result of a free will moral choice with real likely alternatives (for humans those alternatives include the perceived pleasures of sin for a season.)
This Love is way beyond anything humans could develop, obtain, learn, earn, pay back or ever deserve, so it must be the result of a gift that is accepted or rejected (a free will choice).
This “Love” is much more than just an emotional feeling; it is God Himself (God is Love). If you see this Love you see God.
All mature adults do stuff that hurts others (this is called sin) these transgressions weigh on them burden them to the point the individual seeks relief (at least early on before they allow their hearts to be hardened). Lots of “alternatives” can be tried for relief, but the only true relief comes from God with forgiveness (this forgiveness is pure charity [grace/mercy/Love]). The correct humble acceptance of this Forgiveness (Charity) automatically will result in Love (we are taught by Jesus (Luke 7: 36-50) and our own experience “…he that is forgiven much will Love much…”). Sin is thus made hugely significant, so there will be an unbelievable huge debt to be forgiven of and thus result in an unbelievable huge “Love” (Godly type Love).
In order to be forgiven of sin you must first sin, so sin is necessary but not desired.
This messed up world is actually the very best place for willing mature adult individuals to see, receive, give, experience, accept and know Godly type Love. All these tragedies provide opportunities for Love, but that does not mean we go around causing opportunities, since we are to be ceasing these opportunities (there are plenty of opportunities) to show/experience Love.
You do not have to believe the Adam and Eve story is true to get lots of good messages from it. Most people go through a time in which they ask: “How could a Loving God allow such a thing”, which means “why does God not start us all out in a Garden type situation without, needy people, limited resources, death, and questions about His existence?”
What we can do is thank Adam and Eve for showing us and them that what we might consider the ideal situation is a lousy situation for man to fulfill his earthly objective. Adam and Eve as our very best all human representatives did not fulfill the objective while sinless in the Garden and really could not. The situation after sinning outside the Garden did provide a way to fulfill the objective.
I and it seems other have to have opportunities at our doorstep to respond with Love, if I would just cease the opportunities at some distance there might be few opportunities (tragedies) needed for me, so if you want to blame someone for all these tragedies blame me for not ceasing more earlier.
Hell does nothing for the people going to hell, but that was their choice since they kept refusing to accept God’s help (forgiveness, Love, grace, mercy, charity) to the point they will never humbly accept. Hell does help some willing individuals to not put off their acceptance of God’s help.
That is just an introduction.