Kind words won't stop ISIS from beheading people whether Christians or moderate Muslims. Kind words or praying will not stop ISIS from abusing sex slaves. Calling out evil as wrong is a step in the right direction, since it may dissuade others from joining in and end the appeasement that enables more evil.
Sometimes only action will stop evil people from committing more evil. But complaining about the word choice of peaceful people is how you get nations arresting people for criticizing Muslim rape gangs instead of the Muslim rapists (Rotherham rape scandal, New Years Eve taharrush). Focusing on the speech others use instead of actions of bad people is how you get Muslim reformers criticized like Asra Nomani (Muslim woman challenging wife beating by fundamentalist Muslims) per the misguided notion that challenging Islam will lead to more violence, instead of liberals HELPING a Muslim woman trying to reform Islam to end the family violence.