I agree that sometimes writers use "we" in ways that don't include the reader.
For example, someone might say "we" of their nation, and thus include those readers which are fellow citizens, but not those readers who aren't. What sort of examples do you have in mind?
Yeah, “we” meaning ‘Americans’ is the first example I would have thought of. But I suspect there are lots of cases where “we” (interpreting the context literally) refers to a group excluding a non-trivial fraction of the readership which I wouldn't even consciously notice unless I was looking for them.
Original at Washington Examiner
http://washingtonexaminer.com/down-with-politics/article/2508882#.UGSscI0iYZm
Repost at Reason.com
http://reason.com/archive/2012/09/25/why-politics-are-bad-for-us