Tens of thousands of red-clad protesters marched through the Dutch capital on Sunday to demand their government do more to halt Israel’s campaign in Gaza, in what organizers called the country’s biggest demonstration in two decades. Human rights groups and aid agencies — including Amnesty International, Save the Children and Doctors Without Borders — estimated the peaceful crowd at more than 100,000 people, and the streets of The Hague were packed with the old, young and even some babies on their first protest.