Why might a citizen oppose the US government's involvement with the United Nations?

A citizen might oppose the US government's involvement with the United Nations due to concerns about national sovereignty, believing that international agreements could undermine the country's independence in decision-making. They may also fear that the UN's policies do not align with American values or interests, leading to unwanted obligations or compromises. Additionally, some may view the UN as inefficient or ineffective, arguing that resources spent on international cooperation could be better allocated domestically.