The point isn't that they are unable to separate their beliefs, it's that if you give me a slew of arguments (all of which are tangentially related) and I happen to disagree strongly with one of them, I'm likely to focus on that one and argue against that point. At worst, it causes me to reply about my opinion on George W. Bush (and not about XML) and at best it is a distraction and makes me feel like your assumptions are wrong (since I disagree with them on the political plane) and hence there must be a flaw in your higher level argument tying them together.

In my experience people who make such sweeping connections between disperate concepts, fields, events, etc usually have a very shallow understanding of the things they are tying together and tend to be conspiracy theorists, seeing patterns where none exist. Scroll through any "new age" section in your local bookstore and you will find books tying together religion, quantum physics, numerology, human health, evolution, poetry, and other areas in the hope that they are building up a wall of irrefutable evidence by sheer breadth alone. In the end, by their lack of focus, they end up having no deep argument at all and are generally profoundly wrong in at least one (if not all) of the areas they use in their arguments, deflating their entire point.