everything you've mentioned is the result of a fallen world, they're all terrible things which God allows to happenso you're saying that rather than use his powers to help all those starving children in third world countries and other world problems, he'd rather use it to help a person lose their arm because its what's best for them in hindsight
im sure those ppl in Africa are a lot more religious than here, that would be of more benefit to them in the long run
in the end, none of us r God, we can't mark him on how well he's doing his job. the above line is a (possibly valid) thought to illustrate my point