Sometimes, in order to really make your point, you need someone to bring up counter arguments so that you can respond to them. It could be a community meeting, a personal argument, a discussion on social media, or any other public forum.
You've got an idea that needs to be shared with the world, and you need someone to say the right dumb thing at the right time so you can respond to them with your brilliant idea.
Or maybe you've heard the same dumb idea so many times and you need help developing a robust response by arguing against someone who won't simply get emotional and refuse to listen to you.
I have a knack for understanding different points of view and can present just about any argument or idea with sincerity. I will not be an obvious troll, but a genuine participant in your discussion. I will start from the opposing viewpoint, but may or may not be swayed by your argument, depending on what the situation calls for.