If you insist:

- Heinlein

  https://www.spectator.com.au/2019/03/robert-a-heinlein-the-giant-of-sf-was-sexist-racist-and-certainly-no-stylist/

- Asimov

  https://www.publicbooks.org/asimovs-empire-asimovs-wall/

- Clarke

  https://www.vice.com/en/article/bjxp5m/we-asked-people-what-childhood-moment-shaped-them-the-most

  (nebulous, but credible)

- Orson Scott Card

  https://en.wikipedia.org/wiki/Orson_Scott_Card#Homosexuality_2

Sorry if that toppled any of your heroes.

I have book by all of them on my shelves but they're not necessarily saints.