With respect, this is the standard copout for theists who cannot rationalize the Problem of Evil. We are told that God is loving, just, and omnipotent. Some go further and claim that He wills everything that happens. Yet when faced with horrible things that cause untold suffering, instead of admitting that their assumptions must be wrong and should be reexamined, theists simply say, "It's all part of God's plan, and we just don't know." Or in your case, it's that we shouldn't know (is this because of the story of the Tree of Knowledge of Good and Evil in Genesis?)
I would prefer to think that God gave man free will and that it is man, not God, who wills such evil things. True, an omnipotent deity could prevent evil, but it's could be that God determined that free will and moral responsibility were more important than the occasions of man-made evil. But it is inconceivable to me how evil can possibly glorify God.
You have to understand why God even got the whole ball moving in the first place in order to know why the world is the way it is.This is my opinion,but i feel that God created man because he wanted fellowship with like minded beings.Now he could have created a bunch of robots to forever say " you da man God" ,but that wouldn't be sincere or real.The only way to be able to create a being that sincerely loves you and desires fellowship with you,is that it must have the option too also reject you.
So when God placed Adam and Eve in the garden he knew they would eat the apple and disobey his commandment to not eat it.The purpose though was too allow them too freely decide for themselves too pursue the ways of God or to reject them.Now he doesn't cause none of the ill wills on earth but he does allow them too happen and trys to teach us the value in righteousness thru our suffering in sin.
The worlds ills are caused by either the corruption of man and the curse he caused or Satan, since he does have dominion over this world for a time.Even though God allows these ills he always gives you a solution and thats too come too him for help.He isnt a genie in the bottle though and will not answer any prayer thats asked.He will answer prayers that seek to save your soul.
James 4:3
Ye ask, and receive not, because ye ask amiss, that ye may consume it upon your lusts.
Your looking at the ills and suffering from one side,but theres a another side your not even paying attention too.God isnt concerned with your earthly welfare nearly as much as he is your spiritual welfare.Why would he stop all ills but allow man to be corrupt ,that would defeat the whole reason he made us.
Im sure you've heard the phrase spare the rod,spoil the child
Everyone knows that if you shelter your child from ever having to deal with any trials and spoil them, that when they become an adult they will most likely be self serving and uncompassionate ,not haveing the wisdom and experience to be able too understand or embrace why there is value in the things of righteousness.Seeing and experiencing evil allows you to value and hold tight too what is good.
This life wasn't ment to be the time of all Joy and peace ,but this is the time of learning and to show God what you value.In the end he is just, because he will give everyone what they desire.
If you reject God and want nothing to do with him,then he will give you what you want and cast you away from him too hell when you die.Hell isnt what you most likely think it is .It won't be a place of demons tormenting you ,but far worse.It will be a place devoid of God to where you will then realize and see everything he did for you out of love too raise you up to be righteous and the wonders he had en stored for you if you chose heaven.The gravity of seeing the full reality of Gods love he did for you and the choice you made too reject him is why the Bible says there will be weeping and gnashing of teeth,for a eternity without God is a depraved existence with no joy peace or hope.
But hey if thats what you want he will freely let you choose it.