A conversation about conversations, or in this case, a conversation about opinions.
These conversations typically produce no change whatsoever, it's just a dialogue.
Maybe I'll get to your question, but there are a handful of cases where you can change people's opinions.
I get into a lot of arguments with Black people, on Facebook... When a Black person is killed by a White officer, as well as the death penalty.
Imagine telling a Black person that a Black person killed by a White officer is "justified" - to someone that is not the family.
In most Whites vs. Blacks death penalty debates, the Black people always say "you wouldn't support the death penalty if it were your own son."
So, Black people make it about family, then about race. All you got to do, is shift the argument back to about race "what if a White person killed your kids, you would oppose the death penalty for the White person?" And so and so forth.
When a Black person spits on a White officer and the White officer beats him down even if after handcuffing, and Black people develop all these "keep your hands to yourself" policies for the officer, just flip it the other way around "a White person spits on a Black officer and the officer beats the victim, now do you oppose it, do you want to see the officer go to prison" etc.