On a related subject, I do feel like there's been real, tangible moral harm done to our society by reinforcing the idea of debate as a competition in children. When we reinforce certain behavior, we shouldn't be surprised when that reinforcement extends to the rest of their lives.

When we turn debates into something that is "won" rather than something that is seeking a refinement of what we know as truth, we encourage people to use deceptive tactics: to appeal to straw men if they can get away with it, to distract from the issue if they can get away with it, to do whatever they can do to win. That's how you end up with blowhards like Ben Shapiro: people who are more interested in winning a debate by any means necessary and reinforcing their existing belief systems then discovering truth. You get a thrill out of "victory," but it is less than hollow when it's won by appealing to fallacious arguments: it actively works against our ability as a society to understand the concept of truth. And it is so easily abused by people with malicious intent.