Why are Americans who believe homosexuality is innate more likely to support the rights of lesbians, gay men, and bisexuals (LGBs)? Attribution theory suggests that people are more likely to support LGB rights if they do not blame LGBs for their sexual orientation. Alternatively, moral condemnation of homosexuality may lead both to belief that homosexuality is a choice and opposition to LGB rights, while acceptance of LGB rights may lead to a belief in a biological basis for homosexuality as part of a constellation of tolerant beliefs. Using logit analysis on individual‐level data from 24 national surveys conducted since 1977, I find that the link between belief in a biological basis for homosexuality and support for LGB rights is strong and growing for almost all groups on almost all issues. The reason may have more to do with people shaping their origin beliefs to match their political and religious values, than with origin beliefs affecting support for LGB rights.