America stood by and watched despite involvement in other similar civil conflicts around this time
Following the failed American involvement in the Somalian Civil War, Bill Clinton was cautious to do anything to help Rwanda, despite knowledge of a genocide being committed. Bill Clinton even admitted failing and expressed regret over his inaction. The American government therefore favoured preserving its public image above stopping one of the worst genocides of the 20th century.
Furthermore, if we take a step back to look into the ethnic tensions that lead to the Rwandan genocide, there was some US support in these tragic events. But this support was to neither the Hutu government or to the RPF directly. In the early 1990’s as the RPF left Uganda invading the Northern boarder of Rwanda setting up camps, they were being supplied via Yoweri Museveni’s Ugandan government, despite various embargoes and peace agreements. Despite both the US embassy and the CIA being aware of the rising ethnic tensions and the illegal movement of arms across the border, Washington increased both military and development aid to the Museveni government, hailing Museveni as a peacemaker.