Mark Steyn is a talented columnist, with the ability to make his serious points in humorous ways. He is, however, far to the right of center, which isn't necessarily bad but it means, more or less by definition, that most people will often disagree with what he writes.
When it seems he's one of the few people around noticing that the murder of Jews in Mumbai was central to the whole attack, indeed, that bloodthirsty hatred of the Jews is central to the entire Islamist program, we've got a problem. The Jews do, yes, but so does everyone else, too. Because history is replete with movements that put hatred of the Jews at their epicenter, and none of them ever ended up contributing to the well-being of mankind or even of most individuals in it.
One could make a plausible case that violent hatred of Jews (as against the mere garden variety of the animosity) is a reasonable litmus test for the general destructive potential of a political movement, and this has been true for at least 1000 years.
Fortunately, the New York Times today carries a similar op-ed. Which means you don't have to be a right-winger to see what's happening in the world. Some centrists see it, too. Not all of them, and I can't even say if the mainstream does, but enough people to get a hearing in the New York Times.