My primary reason for continuing to argue is to prove a counter-example to the hostile arguments that many theists and atheists expect. When they see that non-aggressive argumentation is possible and get a sense for how to do it, they tend to be less aggressive, more open to discussion, and more likely to try to change the tone of others' arguments - and a change in tone is greatly needed at large right now.
I also believe that the more that anyone talks with others about belief non-aggressively, the more likely it is that they will become an atheist.
I don't have any statistics to run on deconversion, but I can tell you that a lot of thesis and atheists have approached me after non-aggressive conversations to express appreciation and ask further questions. That almost never happened with more common styles of argumentation.
I also believe that the more that anyone talks with others about belief non-aggressively, the more likely it is that they will become an atheist.
I don't have any statistics to run on deconversion, but I can tell you that a lot of thesis and atheists have approached me after non-aggressive conversations to express appreciation and ask further questions. That almost never happened with more common styles of argumentation.