1) The United States' support of Israel: bin Laden believed that the United States was providing too much support to Israel, which he saw as an enemy of Islam. He also believed that the United States was responsible for the deaths of many Palestinian Muslims.
2) The presence of US military forces in Saudi Arabia: bin Laden was a devout Muslim and he believed that the presence of US military forces in Saudi Arabia, the birthplace of Islam, was a violation of Islamic law.
3) The US role in the Gulf War: bin Laden was opposed to the US-led coalition's actions in the Gulf War and he believed that the United States had not done enough to protect Iraqi civilians.
4) The US's support for corrupt Muslim governments: bin Laden believed that the United States was supporting corrupt and authoritarian Muslim governments in the Middle East, which he saw as a betrayal of Islam.
These are just some of the reasons why Osama bin Laden wanted Americans to die. It is important to note that not all Muslims share bin Laden's views and that there are many Muslims who live in the United States and other Western countries who are peaceful and law-abiding citizens.