To be fair, these are athletes. Generally egotistical, generally highly paid and almost never brimming with allegiance to anything. Law Enforcement is different. That truly is a brotherhood. I would be willing to bet that guys like Varitek, Wakefield, and Nomar showed up. That's just the kind of guys they are.
Personally, I would have gone, out of a sense of obligation. However I dislike the entire concept of wakes and funerals. It seems...I don't know, ghoulish to dress up a body and parade it around. Grief should be private, you know?
Eh, anyways, yeah I am surprised they did not attend, especially Pedroia and Lester, but I honestly don't think less of them for it.