“Turning the other cheek” has nothing to do with pacifism but everything to do with being treated as an equal. Christ demands that we defend our faith (1 Peter 3:15) and that our defense may be by the sword (Luke 22:36). What the Master also required was for his disciples to not fall into sin during that defense (Luke 22:40), which means to hate your enemy. This is the most difficult of requirements as humans deeply desire to hate, especially when we perceive an injustice of the type and magnitude being displayed by Islam, specifically ISIS.
As followers of Christ we are given permission to have a righteous anger, meaning we are to hunger and thirst for righteousness. Part of that is defending the faith and caring for the poor and weak. Should that require taking the martyrs crown, then we must face that possibility with the same conviction Christ did when facing the cross. But that would be plan B.
Plan A is to exterminate the cancer of Islam with prejudice.
And to pray for their souls as we extinguish their lives.