Well if you read and knew His word, then you wouldn't be asking these questions. God's word says that He knew us before we were in the womb. God would have it that none of us would perish but come to everlasting life. He created man not machine, which would also mean that each and everyone of us has a choice. We can accept His sacrifice He made for us in order to be reconciled with Him or we can choose to deny it and suffer the sentence of that choice.

God created good and evil according to His word. He created Hitler and Hitler served his purpose for God. God uses evil men to carry out His judgement on a evil generation, group, or nation. But He also created good so that we could be blessed.

To answer your question as best as I can here it is. God created us to serve at his pleasure. Some of us refuse to assume our roles and that brings His wrath/judgement and then you no longer enjoy the life He gave you. But rather you get the sentence that you deserve according to His law. Who are we to question His will for a certain life? He created the life so he can decide to take it as well. The clay has no say in what the Potter decides to form?

I guarantee this though. If the life He created ceases to exist anymore, He offered them a path to redemption. If this hypothetical jungle tribe were to be destroyed by chance and never had a chance to be witnessed to about God's Son's sacrifice for them, well then they would be innocent in God's eyes. I just read it today, if you don't know and are blind to His truth (meaning a witness never preached the gospel to you) then you are innocent.

I challenge you to read and study His word and I'll bet you can understand Him a lot better. I promise you that He is just and righteous in His judgements. Me and countless other's testimonies bear witness to this fact.