Just because you can’t change minds by walking into the centers of people’s bubbles and trying to shout logic at the people there, doesn’t mean the genuine exchange of ideas at the intersecting outer edges of different groups aren’t real or important.
Entrenched opinions are nearly impossibly to alter in discussion, you can’t force people to change their minds, to see reality for what it is even if they refuse. They have to be willing to actually listen, first.
And people can and do grow disillusioned, at which point they will move away from their bubbles of their own accord, and go looking for real discourse.
At that point it’s important for reasonable discussion that stands up to scrutiny to exist for them to find.