How can a god, that apparently loves everyone, allow this kind of thing to happen?

[StuW]

Why? Are you claiming that some people can't grow through the suffering of others? Or do you just not like to deal with that fact?

There's a huge difference between something that CAN happen and something which you state is NECESSARY.

It doesn't matter, as that's not the situation. The question applicable to the situation is, "If a school full of children are about to die and you could save all but one of them, would you?"

I would try to save all of them regardless.