Alien
It could be if the price to be paid for stopping one 9 year old being raped was that two 9 year olds got raped.
Anyway, as I said above, this is meant to be about what makes a person saved in Christ Jesus.
So you now say that it might be morally okay to allow a child to be tortured just for fun even if you could stop it happening?
Yes. Note the word "might".
How can you tell if something is right or wrong then, as you cannot know everything?
The general principles, at least, are laid down in Scripture.
How do you know Hitler did not have some idea of ultimate long term well being for all?
Can I be 100% certain? I can't, but I am 99.9999% certain. There would surely have been some hint somewhere, but there isn't so it seems almost certainly that he didn't.
Do you think Hitler had "some idea of ultimate long term well being for all"? Please make sure you answer the question because, though you are very good at asking them, you rarely answer any.
How do you judge any action wrong?
See above.