How to make the zombies and other creatures be hostile in Creative Mode on Minecraft?

I'm trying to find a way to make the hostile creatures actually hostile in Creative Mode. They won't attack me, but they attack the villages/villagers, as well as my horses and wolves. I've attacked them, provoked them in every way I could possible… Maybe I have to enter a command line or something in chat?

There's no way to make them hostile. Sorry. It used to be like this permanently, but people complained that it was getting in the way of their building. What exactly are you trying to do? Can you edit your answer?

They should become hostile the moment you hit them, at least they do in my world, if anything just type in /gamemode survival
To get them to quickly notice you, just don't get too close.