The average terrorist over the past twenty years IS a brown-skinned Muslim. I'm sorry if that offends your tender sensibilities...well, actually I'm not. Reality sucks sometimes, deal with it.
There is a long list of terrorist activities around the world for the past twenty years that can be directly traced to the actions of brown-skinned Muslims. There is a higher proportion of brown-skinned Muslims than any other skin color or religious affiliation among the terrorist demographic. And they have not been subtle about their intentions towards the entire western world. They are going to do everything they can to undermine our social institutions, our governments, and our economies. They are going to increase their numbers in Western countries that value democracy and force Sharia law down the throats of what will eventually be a Christian minority. And they are going to use the propaganda value of a huge class of people who are railing against the very people who are doing the most to actually stop the murderous scumbags from carrying out their intentions; a class of people so blinded by their hatred for their own culture that they do not recognize the seeds of their own destruction in what they do.
Europe is well on its way to becoming what it was a thousand years ago: a battlefield between Islam and Christianity. And like the last time, it took the Christians a long, LONG time to wake up to the threat. The Islamic wars of conquest began long before the Crusades. There's a reason Spain has so much Muslim architecture.
If anyone seriously believes that a single liberal cause will be respected and protected under Sharia law, they are, quite frankly, too stupid to be allowed to leave the house without a hockey helmet. Gay marriage?

The feminist movement?

The environment?

They make their money from doing what you all want to stop Bush from doing in Alaska: drilling for oil! Universal peace? Only at the end of a gun; it's called slavery.
Actually, there is one liberal cause that the jihadists will happily march in lockstep with their leftist apologists: the annihilation of Israel.