Here's why:
* Present Simple for Facts: The present simple tense is often used to state facts or general truths. In this case, the headline is reporting a current event, but it's presented as a fact.
* Focus on Action: The headline highlights the action of calling for peace, which is something that is happening in the present.
While the situation might be tense, the headline focuses on the act of calling for peace itself, which is ongoing and a point of immediate focus.