The Left has been indoctrinated and indoctrinates others with the idea that Christians and Jews to a degree, are perpetrators of evil. Therefore, they 'deserve' anything that happens to them as righteous retribution for past sins by the underclass Muslims. The Left loves Islam precisely because Islam is so backward and primitive. This characteristic makes them the underdogs fighting modernity and success. Which is one of the Left's banners.
It is anathema for the Left to ever portray Christians and to a lesser extent Jews as 'victims', especially as victims of their very own pet Muslims. The term 'Easter Worshippers', which is a made-up term that has never existed before in all of history, is very deliberate. The Left is attempting to confuse people who are easily confused that it was not "Christians" who were attacked. In fact, if the Left could find a doublespeak way to do it, they would imply that Christians were the perpetrators and Muslims were the 'victims' as this would validate their twisted worldview and the distorted version of reality in which they live.
One of the characteristics of this attack that the Left is struggling to deal with is that there is absolutely no reason or justification for it. It is just hate and death, for the sake of hate and death. There was no goal. It accomplished nothing positive for Islam. It was just blatant unprovoked murder of unarmed innocent people for no reason at all. And we are supposed to believe that their 7th century 'Allah God' is happy with this behavior or at least condones it. The Left is twisting themselves into a pretzel in their attempts to ignore, obfuscate, or confuse this attack or at least to ameliorate the involvement of Islam in it.