This tax was very small and it was payed only by healthy men. Old people, disabled ones, women, children, poor, monks, people who was in army didn't pay it at all.
I know that looking at modern world it's hard to believe that Islam is a religion of peace. Yes, it definitely has stricter rules (for womens, for example) than other worldwide religions, but it doesn't mean that this religion puts war as something good. All these modern terrorists, immigrants, retarded government leaders (hello erDOGan) who're using Islam to cover themselves and their own goals, doctrines and crimes only shaming true Islam and it's teaching.
And I'm telling it to you while being Catholic. So, no religious bias here.