Robert Downey Jr.'s visit to Wall Street in the 90s, in the context of the documentary *"The Last Party"*, was likely driven by curiosity and a desire to gain a broader understanding of American society. At the time, Wall Street symbolized both economic success and the social inequalities, as well as the excessive financial power that dominated U.S. politics and culture.

Downey Jr., who already had an established career, was going through a tumultuous personal phase while exploring significant social issues. He seemed interested in understanding what drove financial power and how it influenced the lives of ordinary people. The documentary he participated in reflects his attempt to grasp the political, cultural, and economic context of 90s America, and Wall Street, as a financial hub, was a crucial place for that analysis.

Moreover, the visit may have been motivated by the inherent contradictions of the place: while many viewed Wall Street as a symbol of success and prosperity, others saw it as the source of corruption and inequality. Downey, with his irreverent style, may have been trying to capture that duality, expanding his understanding and sharing it in a critical and curious way.