Age old questions. I remember seeing TV news footage many years ago of the Ethiopian famine where an emaciated mother with her empty breasts, clutched her baby and cried out in a weak voice, 'Jesus, help me!' over and over. I still have tears as I think about that image.
As one of those who 'prosper' in a material sense (I lack no essential thing and have many non-essentials) I suppose the thing I have to ask before God is: What is my responsibility in handling my comparative wealth so that others don't suffer? I am not God and am not responsible for the whole world, but only those things he has given into my stewardship. The rest I have to leave to others for their conscience.
As for the 'monsters', I'm with David. The great thing about the Psalms is that they show the whole gamut of human emotion. A lot of modern church 'worship' is about feeling good, confident in the fact of God's goodness and being upbeat. That is important. But so is not denying the real world challenges of poverty, injustice and plain evil which blights our world. I want to know why my friend died on Monday with COVID when he did so much good. I am not angry, but I'm not going to pretend I can be happy. I need to express that to God as well.
The answer I have come to is that this side of Glory there will be many things that confuse and defeat our thinking. We do what we can where we are in prayerful submission. In Gory, to be honest, I doubt it will matter.