What strikes me on Stallman.org is headlines like "don't use Facebook" or "don't buy Harry Potter books". How do you convince anyone with such agressive, patron

What strikes me on Stallman.org is headlines like "don't use Facebook" or "don't buy Harry Potter books". How do you convince anyone with such agressive, patronizing statements ? This is plain ignorance of the simplest of psychology, rhetorics and marketing rules.