I don't defend Christianity for placating us, if I did then I retract that, I defend Christianity only in the case that it allowed us to cement our culture (considering our previous cultures and Christianity weren't too different) and that Christianity allowed us to survive through the hardships brought by Islam while Assyrian pagans, who still believed in our old gods, pretty much went the way of the dodo bird.
However, just because I defend Christianity does not mean I defend every part of it. The place where we live has danger and we need to protect ourselves. The Kurds who killed the little girl thought they could do that and not expect a reaction from the "peaceful" Christians.
Christianity has no doctrine against the use of self defense and defensive fighting.
https://americanvision.org/12889/jesus-guns-and-self-defense-what-does-the-bible-say/
that's obviously some American Protestant stuff but I'll find an orthodox one. EDIT: here's one from Russia ->
http://www.pravoslavie.ru/english/96216.htm
Jesus said that our beliefs will get us persecuted, thus it makes sense that the verses hinge on self-defense but the Bible is also careful to say not to be "offensively-defensive" by saying "he who lives by the sword, dies by the sword"
"As for the first question, there is nothing in Scripture that prohibits the private ownership of weapons. The passage in Luke 22 does not require us to own them, but it does not forbid them either.
The problem is that, usually, oppressors don't stop oppressing the weak simply because we ask them nicely to do so. More often than not, force, or at least the threat of force is necessary. So do these scriptures contradict the commands of Christ? No, they refer to defending others, not to seeking revenge."
And this is just the Orthodox view.