Ah, yes; you get all the [censored] bad luck. Sitting in front of your rather expensive computer, out of the rain, with a full belly, have all the [censored] bad luck. Of course. Because, you know, there aren't, say, children getting molested by their parents, or people getting tossed out on the streets, or starving to death..... you get all the [censored] bad luck. Of course you do. It's not like you're the one without any real-world problems. Roof over your head? Clothes on your back? Food in your belly as needed? Perspective.
The Bible doesn't usually list God's motives, but you might think of looking into
One Group's Take on the subject.
My own understanding mostly boils down to "free will". People take actions, and actions have consequences - good, bad, and unintended, for the person who acted, for the person who didn't act, and for those not otherwise involved. When someone chooses to murder, that someone also chooses another to kill. When someone chooses to be indiscriminate in their relations, they choose to run the risks involved. Multiple people get similar ideas all the time - some choose to follow up, and some reap the rewards; others choose not to, and don't. Others enter into, and follow through on, agreements that are more advantageous to one party than the other. Occasionally someone betrays a trust. You refer to "let" - yet the specific criteria kinda implies "force" - be that motives, body type, or other choices; would you marry a robot with no choice but to follow it's programming? Would you want to live in a world where everyone was identical?
The world is as our collective choices shaped it, and of course, God gets the blame. Easy to blame someone you don't really know, and not have to put the face of your neighbors, your friends, your family, and yourself as the causes of your troubles, isn't it?