Quotations, like any other meme, do not exist in a vacuum, and are sometimes taken up by ideologies to justify different agendas. It's fine to like a quote for the value it resonates with oneself, but you can't ignore that it also exists within a larger culture- http://tiny.cc/pinojz
Yes, you can. Those who get hysterical about which other people might believe the same things are actively ceding control of that message to them (the "Hitler was a vegetarian!!" problem)
