Doesn't work.  For example, I've thought a lot about it, and no-one can convince me that "diversity is our strength", in the way it is meant by Canada's Liberals and liberals.  In fact, I believe diversity, too much of it, is Canada's weakness.  My mind is made up on that.  Do you think by advocating for that I can change even one person's view?  So advocacy, in the end, does not always work.