Look while it was terrible, and I know firsthand as my Dad was flying a Lancaster that night, it was quite possibly the right thing to do.It was 70 years ago and it was a world war with comparable action from the enemy.
It was also to try and stop the Reich and National Socialism taking over the world, to stop our own Islands being invaded and to stop an evil regime that was busy trying to wipe out an entire race of people, gays, the disabled and anyone who they felt wasn't pure enough.
You keep on trying to make silly points and people will continue to pull you up for it.