Read other letters about this article
Attacking civilians is as American as apple pie. Many (perhaps most) Americans regard U.S. participation in WW2 as our most heroic national achievement, one in which we quite intentionally incinerated hundreds of thousands (millions?) of German and Japanese civilians. America doesn't do anything unjustified, so of course attacking civilians can be justified in some circumstances, like when America does it.
Evidently Malkin et al want me to be terrified of terror bombings in America by Muslim Americans. As of now, I'm still more concerned about terror bombings by white, ostensibly Christian Americans, which have, you know, actually happened.
This is pure guesswork, but with respect to those American Muslims who indicated that civilian attacks could be justified in some circumstances, I'd bet at least some of them were thinking specifically of Palestinian attacks against Israel, and declining to implicitly condemn them by branding all civilian attacks as unacceptable. This merely reflects the bilateral savagery of the Palestinian-Israeli conflict, and has nothing to do with the spectre of home-grown "suiciders" in the U.S.