Aah yes, sorry, my mistake - your ancestors fought Muslims. Obviously that justifies your current recumbent position.
In any war, not everyone fights directly. Those who don't have three choices: to support the fight, stay quiet (do nothing) or undermine the fight. We all know the famous quote: "The only thing necessary for the triumph of evil is that good men do nothing." That addresses those who stay quiet.
We are already fighting. I support that fight.
Those who would rather retire to a library to "study the problem," those who bring the Crusades, Bhudists, Indians, etc. into the discussion, those who say " they aren't necessarily evil, just made up of people doing what they think is best for their community," those who refuse to see or admit the only-too obvious link to the religion, they are those who effectively undermine the fight.
I am all for a careful analysis. I am all for an open debate. I am all for admitting past mistakes we did. But there is time for analysis and time for debate, and then there is time for action.
This it the time for action.