George Carlin, Rudeness, Mockery and Ridicule

No one who engages in rudeness, mockery, and ridicule to try to affect oppression is doing so for personal gain of any sort, let alone an elevated personal opinion in the eyes of the oppressors or even the oppressed. 

What it achieves is getting people to think; even if only to think hateful thoughts.  Getting people to think about their beliefs in any way is the only way to change them. 

While you are correct that it rarely achieves an immediate positive change longer term it will make a difference.  I hold that rude, mocker and ridiculer George Carlin responsible for the fact that atheists can at least check that box on a poll without fear of reprisal at least in some countries and parts of the US, Fort Wayne excepted.