In other words, don't use any other methods but the also often changeable concept of right and wrong to persuade people.
Clint, why not use logic if it might win people over?
Because he doesn't care.
Sorry my little moral relativist but right and wrong are always right or wrong, they never change. And guess what, murder is always wrong.
For the most part, people are quite illogical (even though most would deny that). The vast majority of Americans operate based upon emotions. I think we'd do better to stir up the emotions of those whose minds we wish to change.