I think the rulers of the world would probably change their tunes if they ever ended up, however briefly, under the rule of a spirit of disharmony.

Or with the threat of windigos, for that matter. A long, long time ago ponykind was divided amongst its types, with the pegasi and the unicorns and the earth ponies all divided up and at odds much the way you describe, each seeking to gain at the expense of the others. Their hostility and anger nearly doomed them all, for it attracted windigos, who fed off the coldness in their hearts and brought an eternal blizzard to the lands in which ponykind used to dwell. Only when three hopeful young ponies, one of each kind, found friendship and the hallowed Fire it could summon, did the windigos retreat. And that friendship became the basis on which Equestria was founded.

You may take what you will from knowing that it took ice and cold to finally bring forth warmth and love. [She smiles sidelong at Elsa.]