What is the intention of Zhao Huiwen in Su's fable that snipes and mussels compete?

In this article, the debater used fables to illustrate that the stalemate between Zhao and Yan would bring harm to the two countries, thus preventing Zhao from attacking Yan. The idiom "the snipe and the clam compete, and the fisherman gains" evolved from this. It tells people that in all kinds of complicated contradictions and struggles, if the opposing sides are deadlocked, they will both lose and benefit the third party. Therefore, in life, we should learn to grasp the main contradiction, and we should not lose big because of small things. It tells people that the weak and the weak should unite, eliminate contradictions, unite as one and jointly deal with the enemy at present. The same is true of dealing with internal affairs. Local interests should obey the overall interests, immediate interests should obey the long-term interests, and small principles should obey the big principles. Otherwise, endless internal struggles and intransigence will only hurt both sides and benefit the third party.