You can create a music group and promote peace, love, etc., make films, organize various contests, campaigns, and exhibitions. You just need to believe in what you're doing, live by it, and maybe then people will follow your example and change their views. (not everyone, of course, but at least some)
And also, regarding the conclusion... the idea is that he himself seems to have changed, he just wanted others to change, i.e., he already had these views, etc., but maybe it means whether he showed people an example of his views, i.e., whether he behaved the way he said, or was it just talk?