You have broken the world into two groups: healthy arguments and constantly combative. But there is no hard criterion to separate the two. And you spuriously assign anyone to 'constantly combative' who cuts an interview short, when this doesn't at all mean that someone has no clue and likes fighting for no reason.

So consider the possibility that you are assigning people to 'constantly combative' when you simply don't like their smart and inventive ideas and healthy arguments. Perhaps one healthy argument too far hurts your ego and becomes 'constant combat' without being any less healthy in reality.

That incentive structure is all it takes to make a whole dept. or whole company act in an essentially delusional and inwardly-focused way.