It's deeper and more important than that.

God made us.  He made us limited.  This is His will.  He can use our limits and our mortality for purposes we can't imagine.  

We need faith...trust beyond the limits of our relatively puny intelligence...that he can work all things to the good:  Unity with Him now and in the hereafter. 

I have great sympathy for you and for all who are suffering or helping others suffer.  Dealing with serious illness and death is not foreign to me.  

I have a child with cancer.  I've dealt with my parents' deaths, friends with cancers, helping my neighbor now deal with an awful case of cancer.

I've lost Marines and friends in combat.  Watched it happen in front of my eyes.

God wills unity with us. He doesn't will utopia for us on this earth. He gives help/graces.  

Not accepting His will "distances" us from Him.  This dampens our spirit. 

The Church has some great teaching on dealing with illness and death. It's not very well or frequently taught.