I think the protests you mention including the Vietnam War are/were close to home. The causes noted impacted Americans directly. I don't see the protests creating more real empathy for the Palestinians and by virtue the Hamas leadership.
Other than my most progressive friends, most of them who want to see a cease fire just are tired of 75 years of fighting and fruitless peace discussions. This seems a way to put things on the back burner and avoid more carnage and destruction for the time being. I'm not even sure the protesters have any workable solutions in mind for Palestine beyond a cease fire.
As a separate note, I am not a historian but we know the Germans and Japanese were decimated. They came back with much assistance from the West to build great economies and successful democracies. Does anyone really see the Palestinians grabbing that olive branch and also Western and Mideastern assistance to build a thriving country? It would appear the Palestinians are more excited to get a box of missiles from Iran.