A common Islamic apologetic argument is "look at the extermination of the Natives of the Americas, that proves western civilisacion is is worse than anything the Islamic empires did"
I am not aware of any Christian suicide bombers. I am not aware of any major Christian denomination that believes the penalty for apostasy is death. I have mixed feelings about the decline of Christianity, in so far as Christianity might be a bulwark against something worse.”Richard Dawkins
Somehow this is a kind of thing is a favourite way to try and defend indefensible things in Muslim circles. It is a logical fallacy, called "Tu Quoque". It is saying somethings is not really bad because something else is worse, which usually completely unrelated. A kills his neighbour B because he hates black people. In court his defence is "Hitler killed millions of Jews, and you are concerned about ME???" I am sure you agree that defence would not work very well at all. Hitler's behaviour does not justify or excuse anybody else's bad behaviour.
It is frustrating that many Muslims will keep on referring to tu quoque arguments over and over, however many times you tell them that it is a logical fallacy.
The most recent one of this kind was about Ariel's video clip about two Jewish guys being pelted with snow balls by a bunch Arab kids. The excuse given was that "the Jews" kill and illegally imprison many Palestinians, so how dare she mention an incident like this.
THESE TWO men did that? How does one alleged bad thing justify another?
I have gone over this so many times with Muslims I lost count. And it comes back like a bad penny over and over.
Jesus: "Ask and you will receive." Mohammed: "Take and give me 20%"