I'm not a fan of Islam or Arabs. But is it worth it to go on the offense in the middle east(again) instead of just defending?
No defense is perfect. Sooner or later, defenses are going to be penetrated. So it would be costly to be on the back foot. Islam has attacked Europe several times in the past 1000+ years. Their most successful conquests were Spain and Eastern Europe. In the case of the former, they had reached mid-france before being driven off and in the latter they reached Italy and Poland. They're not going to stop. Their scriptures command them to kill, convert or conquer and tax all non-Muslims.
Can't say why they wouldn't
Yeah and don't forget India and sub-saharan african nations. Muslims would sorely lose ww3