Ollie.
To answer points 2 and 3, he is a God who believes in free will. He made us, he could have made us all built to love him and conditioned for total obedience no matter what. But instead he made us a little lower than the Angels, and in his image, male and female. He gave us free will, it's up to us to choose to believe, or not believe, it's up to us to follow him or not, to make good or bad decisions.
Wars, arguments, murders, foetal alcohol syndrome, abuse, climate change, man-influenced "natural" disasters; it's all down to us. Not God.
If you believe Genesis is literal rather than a description and a guide, then he's already pretty much wiped us out once, and then promised never to do that again (Noah and the flood).
Instead, he sent his son down, to explain it all over again, God made vulnerable as a helpless baby, God made human and irritating enough to those in power that he was killed all over again. And in doing so, paid the death-price for all of us, forever. And so we are now living in the between times, in the time where God's grace and mercy have been poured out and are available to anyone who wants them. But before he has come back in power to wrap this whole thing up.
I can't explain the natural disasters which have happened without reference to man, except to say that this is a broken, imperfect world.
I don't think his plan involves us all dying in the end - it involves the hope of Life, eternal life, for everyone. They very opposite of death.
Point 1. Yes, he could have stepped in. And no he didn't. And no, I don't believe it's ever in his plan for parents to outlive their children. But children do die. Sometimes directly as a result of something visibly human - active malice, murder, etc. Sometimes as a result of human weaknesses and errors - medical errors, illnesses caused by man (pollution based asthma, deliberate exposure to noxious substances, car crashes, that kind of thing). And sometimes due to these flaws in creation which are a part of this world being broken. I don't know why or how he can look on at so much suffering. But I do know that he hasn't turned his back on it, that he feels it as deeply and as intensely as we do, probably more so since he doesn't have the ability to switch off the news and pretend it isn't happening.
And I know that my child is fully healed, fully restored, fully beautiful and while and perfect now. I know that we will meet again. I know that there is no more pain for my child - and I know that they were more than ready to be free of that pain.