Arrogant? I didn't think so. Be careful that your own interpretation of Christianity isn't biasing you in any way. Perhaps it is arrogant to think your interpretation of Christianity alone is right and President Bush's is wrong, or "arrogant" as you say.
While it is true that only God can rid the world of evil, perhaps President Bush rightly sees humanity as the humble tools of God in this holy endeavor. There can be no denying that the uplifting of mankind has taken place in the past 2,000 years, and mostly in areas of the world which honor God, as the whole prosperity of the Western world happened in the wake of the Westerly flow of Christianity.
Any man or country that thinks they can rid the world of evil, is arrrogant and misguided. Yes, gov't is ordained by God to restrain and punish evil Romans 13:1-4 but to even dream it can be gotten rid of is ludicrous and dangerous. You might as well think you can eliminate death. Only Jesus Christ can do that.
It is not my interpretation of the Bible it is Historic, orthodox Christian teaching through the centuries. Plain words spoken by all the writers of Scripture.