I'm not sorry about slavery because I wasn't a slave holder. Don't expect an apology. Who would I even apologize to, anyway? All the former slaves are long dead as well.
Institutional racism is a myth. Institutions are not moral agents. Institutions don't sin. It's the people within the institution who are guilty of sin, and those individuals must answer to God for their own sin.
And don't expect an apology for the mistreatment of homosexuals either. I've never done that either.