"Take their wives as war booty"

Natural and simple.

Islam gives you full authority by the name of Allah to get everything you want.

To be a winner!

Is it bad?

Yes it is bad for loser.

And it is good for winner.

It's not about the war or terrorism only. It's stick deep inside personal relations of a people. That's why Arabs feeling complete ownership for everything in this world and most of a time get what they want.