People who refuses to acknowledge God's will in such matters are usually false prophets (e.g. 1 Kings 22) or they have a terrible understanding of the love of God for us. God is sovereign and reigns on high. His desire is for us to be holy as He is holy. He never promised us a rose garden but He will be with us in the path He as chosen for us if we let Him.
We need to reflect why God has brought this about rather than creating outcomes we would like to see happen.
There are courageous Christian leaders who will stand up to aggression using the cross as their only weapon. He is courageous to take his stand against these terrorists. The Christians who are killed in the Middle East will not die in vain.
Reverend David Wilkinson worked against gang violence many years ago. He went to the streets of New York with a bible and some people were converted to Christ.