What are the ideological characteristics of "Tiananmen Poetry" as a mourning poem?

Comrade Zhou Enlai died during the national crisis. Although the people feel extremely heavy about the unpredictable future, Tiananmen Poetry is not full of tears, but full of sadness and anger, which strongly reveals the people's firm belief at this moment: "Tear and inherit the wishes of the Prime Minister and sacrifice the soul of the hero with blood." "The Prime Minister should be comforted when he knows it, and the flag will follow." "The Yangtze River is endless, and I swear my wish will come true." This is a distinctive feature of Tiananmen Poetry as a mourning poem in ideological content.