What is the main point of Harvey Milk's "Hope" speech? What is the evidence that supports his main idea?

Harvey Milk was the first openly gay candidate elected to political office in California. In his speech titled “The Hope,” delivered on June 25th, 1978 at a public celebration of the California Gay Freedom Day, Harvey encourages the LGBTQ+ community and all other discriminated minorities to fight for their rights as a people.
Through his speech, he highlights the hardships experienced by discriminated minority groups, such as the LGBTQ+ community, African Americans, and other minority groups. Examples of these difficulties include religious fundamentalism (as exhibited by religious leaders such as Anita Bryant, who publicly attributed the drought in California to homosexuality in the region) or the creation of negative narratives aimed at ostracizing minority groups.
After highlighting these difficulties, Harvey explains how they can be overcome through the election to public offices of strong, independent leaders, who are themselves a part of the minority groups who have been discriminated upon. He states thus,

“That the myths against blacks can only be dispelled by electing black leaders, so the black community could be judged by the leaders and not by the myths or black criminals. The Spanish community must not be judged by Latin criminals or myths. The Asian community must not be judged by Asian criminals or myths. The Italian community must not be judged by the mafia, myths. And the time has come when the gay community must not be judged by our criminals and myths.”

He goes on to explain that such leaders would help change the negative narrative about their groups by offering guidance, “examples and hope,” to the young while commanding the respect of the larger population. Harvey ends his speech by reiterating the importance of electing members of disadvantaged groups—gays, seniors, black people, the handicapped, etc.—to positions of power, stating that it gives hope to others within these groups to continue with the fight for equality, for if they can make it, then “the doors are open to everyone.”