Not justified but predictable. Shakespeare's problem plays are now popular in our post-modern world and the old standards The Merchant of Venice, Taming of the Shrew, and Othello are problems because of antisemitism, sexism, and racism.

I don't know what the threats of violence were as the theatre wouldn't talk about it. I don't think serious threats of violence are justified, but I seriously question a theatre's ability to communicate if they haven't a clue as to why whitewashing Othello would be considered racist and offensive.