The diversity isnt so striking, when one considers the two commonalities. Would it be striking that housed people with higher income form diverse groups? That is essentually what many modern cities consist of.
Still there is either ignorance about or refusal to acknowledge homeless or nomadic individuals being targeted into thier current circumstances.
This is akin to doing a total run down of US economy and leaving out black market monies, products and services.
You may get a result but it is never an accurate one.
To continue to avoid the influence of oppression, political or otherwise on the homeless population is irresponsible and will result in a never ending problem.