The ending scene on the bridge pretty much sums it up. Kirk gambled on the Eminians not having the stomach to wage real war particularly with the Federation. Anan thought they were badass until Kirk threatened him with what one
Federation starship could do.
And Kirk was ultimately right. He did put a stop to it all with one simple disruptor. The Eminians were so focused on thinking in conventional terms and worrying about what the Enterprise
would/could do they couldn't imagine what just one man could do.