It's usually an argument of emotions where you have one person that feels so strongly about Unions trying to present his or her opinion on organizing to another person in such a way as to compel that prospective brother or sister to join up the ranks. A lot of times the prospect thinks that the Unionist is coming across too strong and condescending, then gets sensitive. The following quotes are from Abraham Lincoln about Labor. Labor is prior to, and independent of, capital. Capital is only the fruit of labor, and could never have existed if labor had not first existed.
Labor is the superior of capital, and deserves much the higher consideration.
Lincoln's First Annual Message to Congress, December 3, 1861. All that serves labor serves the nation. There is no America without labor, and to fleece one is to rob the other.