The lottery draft caused so many protests because it was seen as unfair and unjust. Many people felt that the draft was discriminatory, as it disproportionately affected working-class and minority communities. There were also concerns that the draft was being used to support an unpopular war, and that young men were being sent to fight and die without their consent. Additionally, many people believed that the draft was being manipulated by the government and the military, and that it was not a fair and equitable system for selecting soldiers. All of these factors contributed to widespread protests and opposition to the lottery draft during the Vietnam War.