Every community I have ever been in has had a subculture and that subculture has been driven by the subject of that community tending to draw a certain kind of person to it. I'm not saying every individual in a community is the same, but I do think trends happen.
As far as western people with an interest in Buddhist meditation goes I would say there is a tendency to find people who are smart, introverted and who tend to withdraw from facing situations with strong feelings.
In my life experience nothing frightens and angers people like this ( and I write this having some of these tendencies myself ) more than having "their cloud" disturbed, especially with the possibility of having to get involved with other people. Nothing does that as much as political causes focused on helping the unfortunate. Scary as hell. A lot of ugly things to be faced, instead of avoided by sitting in a meditation hall. Bhikkhu Bodhi by setting an example, I think, stepped on a raw nerve.
In reading the scriptures, there are two kinds of mistakes:
One mistake is to cling to the literal text and miss the inner principles.
The second mistake is to recognize the principles but not apply them to your own mind, so that you waste time and just make them into causes of entanglement.