OK .. I do understand the way you think on this, I thought the same at one time. And I certainly don't like the way the world is now.
But there is really a bigger picture on this.
Satan and man chose not to be loyal to God. Even though they had everything, even perfection. Now if they were still perfect they would never die, the diseases we have now may not affects us, but the way man treats other men, would be with us for ever. This world would be just a scary place to live, with men hunting men until nobody would be left. With no hope of correction. Now if God just got rid of ones that didn't want to follow him, that would not answer the question, to the other creation ( the angles) that people wan tot serve God , because they appreciate life and the other creations God did. ( like the animals the universe etc. ) So God had to let this world go to the brink of destruction, to let this question be answered once for all time. He set a date when he would step in , and that date is set. He does not change that. We are not told when exactly that date is, but we were given signs what to look for. When he does step in , things will go back to perfection over time. So then it is over with. So the world we see today is with out following God, perfect and able to live forever with sickness without wars, without all thebad we see today. The bible even says this what we have now is not the real life. But this can only work , with people that want it. So it really comes down to heart condition ( attitude).