Calling Islam a mental illness is quite polite actually.
It is barbaric and premedieval, and I can think of far less polite expressions to describe it.
It is also worth noting that Al Qaeda, in the form of an organization called the Turkistan Islamic Army, is stirring up trouble in China's north-west provinces, and is gaining a lot of support.
As bad as the Chinese are (see Tibet for example), brutal fundamental Islamic thugs like Al Qaeda are far worse, and anyone who supports them cannot be thinking straight (or maybe you think Al Qaeda would be the answer to any problem that, say, California, has?).
Every time though that extreme Muslims finally get their due comeuppance (see also Myanmar) in this world, you get apologists for them ridiculously complaining how they are the sad and unfortunate victims - when they actually caused the trouble themselves in the first place! (See Myanmar, again!).