The same reason we speak out against those who would have Iraq remain a dictatorship. The same reason we speak out against attacks on Muslims in the United States. The same reason that Americans speak out against the neo-Nazis and the KKK. Because they suck and we want them and the rest of the world to know what we think of them.
Amen. Aren't these the same people that whine and cry about anti muslim/islam racism the world over?? The only time they do speak out publicly is when there's a perceived backlash against them in the wake of terrorist attacks. Basically, they care only about themselves.
Bush and many others went out of their way to differentiate between muslim perpetrators of atrocities and peaceful practitioners of islam (though that's a relative term). That is what makes "them" different from us the civilized world, because we care, we're not selfish and only bitch when bad things are done to certain people. With that kind of selfish attitudes, they have no moral right to complain about anti islam or anti muslim prejudices.