No it's not. Iraq isn't ruled by pro-Iranians either. Whilst this may be cruel, hard and difficult to stomach it is the world we live in. The judiciary system in every part of the world punishes wrongdoers with prison sentences and death penalties.
This is not anti-Arab or anti-Sunni, it's a counter-terrorist campaign. If the ISF wanted they could have executed these IS members on the spot, instead they sent them through a judiciary trial. YES it would have been really nice if they could have been forgiven, sent back to Europe (Europe doesn't want them) and everyone live's a happy life. That's just not how this world functions. Local Iraqi women that joined IS, mostly forced are often forgiven. Women that travel half the world don't have as much to bargain with.
If the ISF falls it will be ruled by ISIS whose leadership are ex-republican guards who will then in turn be burning Iraq's neighbors mainly the Arabs and Europe.