St Augustine says you either interpret the harder cases from the totally clear OR you are not taking the Bible's message in any sense.
So very clear is GOD IS LOVE
then you see the Flood and you ask, Was that from Love ?
I never had a problem with that. I don't think they all went to Hell. Heavens, that is a inexcusable interpretation. I think that letting the world just get more and more corrupt and violent would cause far greater problems
Would exterminating ISIS be cruel? Even to the members? NO.
Once you admit freedom and evil there is only How is it to be dealt with?