You're right on an individual level, but when you extrapolate a less argumentative approach and encourage curiosity rather than beligerence I do believe society overall is amenable to change. On a macro scale it works. I'm loath to point to abortion specifically as in the example as it's a devisive issue but Ireland which voted to allow abortion two years ago in a landslide referendum is an example of society changing its views as a whole, even while some individuals in that society remain immovable.