I don't go knocking on doors giving people Jam CDs and saying,"You really should listen to this, it changed my life and can do the same for you". I respect the rights of others to like what they want to like and believe what they want to believe. Just because I'm into something, doesn't mean everyone (or anyone) else is or their views need changing.
What they do is morally and ethically wrong, not to mention downright rude.