No one actually believes he ended the war
There is no war, there is an ongoing genocide of Palestinians by the settler colony of Israel.
And yes, the genocide very much didn't end unfortunately, and it won't end until Isntreal is driven out of the region. But it has been ameliorated. By all accounts, dem supporters constantly were ranting about how "not voting for Kamala worsens the genocide", and this is, factually, not what we're seeing.
Trump has purposefully made the genocide in Ukraine far worse
There isn't genocide in Ukraine, there is an inter-imperialist war going on in Ukraine. Using the label "genocide" to every conflict is very harmful to people like Palestinians who are actively being starved en-masse and kept out of reach of basic medicine, healthcare and even fucking drinking water.