Arguing with a leftist

I realize arguing with leftists on social media is futile as their ideology is usually so ingrained that they are beyond help. 

However, I sometimes find it good mental exercise that can help my own reasoning and understanding of whatever the given situation is.

Occasionally, the opponents have valid points and I'm made aware of flaws in my arguments, which I'm not too proud to admit.

Anyway, here's today's exchange provoked by the meme above, which I publish here for the record verbatim.

Him:

"Why aren't christian extremists extremely forgiving?"

Me:

"This is about Islam. If you have issues with other religions, please ask them as I have little or no knowledge of extremists of other religions because compared to Islam such extremism is negligible and not a cancer on the world.

And even if there was any validity to your question, I'm surprised you advocate two wrongs making a right.

Him:

"I am not advocating two wrongs making a right. I am saying one question is ridiculous. There is plenty of extremist christianity.  George Bush even had the temerity to mention the crusades while he was bombing the shit out of Iraq.  Though I have the feeling he did so out of sheer oblivious lack of self awareness rather than actual intention to bring up the actual crusades (to give him the benefit of the doubt).  To single out Islam as a cancer while neglecting to note the influence of our "christian" based culture on the rest of the world is kind of amazing.  Or for that matter Zionists in Palestine.  I am in no way suggesting those wrongs make the others right.  I am just saying the premise that Islam is alone in this or even leading in the body count is beyond ridiculous.  Crack a history book."

Me:

"Indeed, I stand corrected and concede Zionism is an extant bloodthirsty extremist ideology. If we're in the genocide Olympics, socialism is statistically a gold medalist. 

Regarding Christianity, crack open the history books and look out for the following:

Renaissance 

Reformation 

Enlightenment 

The odd evangelical stopping me in the street or knocking on my door, or a Gideon's bible in a hotel room hardly compares to daily slaughter to cries of "Alluha Akbar!"

Indeed, examples of the liberal definition of Christian extremism are opposing the multi-million dollar industry of murdering unborn babies, and refusing to bake gay wedding cakes. While such a twisted leftist worldview prevails and the welcoming and apologizing for genocidal maniacs continues, more native Western folks will drift right into equally toxic ideologies as Islam and socialism, and the perpetuators of this unsustainable paradigm already have blood on their hands and seem intent on plenty more, either through ignorance or intent."

That's it for the time being; I'll add any updates should they occur.