Its not required. I don't see where the young lady forced her views on others. They are her views. And nothing about a commencement event should lead people to conclude the government agrees with the speaker's views or lack thereof. It simply provides a public forum and as such doesn't necessarily mean it agrees with the views expressed there.
(Denny Crane: "I Don't Want To Socialize With A Pinko Liberal Democrat Commie.Say What You Like About Republicans. We Stick To Our Convictions. Even When We Know We're Dead Wrong.")
I don't see where the young lady forced her views on others. They are her views. And nothing about a commencement event should lead people to conclude the government agrees with the speaker's views or lack thereof. It simply provides a public forum and as such doesn't necessarily mean it agrees with the views expressed there. You are missing the point. What if more people shared her lack of commmon sense and decency and decided to answer her altar call and came forward? What then? Should the Protestants, Jews and others just "boycott" the event or sit by quietly while the public high school's ceremony turns into a sectarian religous service?
SD