Threatening...no, not in the least. I'm just flabbergasted as to why he feels it's necessary to caution Christians to not to get on their high horse by randomly invoking some semblance of moral equivalency to 1000 year old events.
Because it is the same moral equivalency, the good guys with the right god go out to kill the bad guys with the wrong god I told you that you believe in the good and by doing so you create evil but you do not see this because you are unwilling to die to your belief. Your belief is tied to your ego. Because you believe in the good, you believe your ego is good. But your ego is like everybody else's ego, the creator of evil. There is no good and there is no evil. There is only the kingdom of heaven, the garden of Eden, from which you were cast when you bit the apple of language. There are only those who have awakened in the eternal now, and those who divide the world into nonexistent parts with words.
The real good is whole and undivided being: what you believe in is a delusion created by words. Let go of it.
The main thing that Londo offered you was how a mind not poisoned by attachment to religion but still conservative heard the Presidents words. Had you been more charitable in your reading of his post you would not have picked it apart as you did. It wasn't denial that Christians killed that he really meant to say, nothing we post can't be improved on, as we know from Boehner, but the childish defensiveness that occurred when Obama mentioned the Crusades, the notion that that motive for killing a thousand years ago isn't alive and well today and being dusted off by some of our modern day frightened amygdalae.