[verisimi]

I don't care about Wittgenstein or Chbosky. I can only care what meanings mean to me.

The use of 'we' is fine in many cases - when talking about a holiday, I can say 'we went to the beach' and that is understandable because of the context.

Its not fine to talk about 'we' in the context of something that is subjective, eg understanding or knowing. It is an assumption to say 'we know' unless you have checked all the people you are referring to really do know.

If you think this usage is acceptable - and apparently most people do - I'd love to hear an explanation. To me, it is sloppy and confused thinking, and actually it's use is ultimately a type of casual lie, because it overstates whatever-it-is.