For the life of me, I can't figure out whether or not you think prayer is appropriate in this context. I think you're saying it's the job of the school board to strong-arm people who dare to openly pray when they are on public property.
In which case, you're full of shit. No, the school board is not an enforcement committee charged with racing up on the stage and hustling off radical prayers to the back.
And it's perfectly appropriate for a child graduating from a public school to lead those who wish to join in, in a solemn prayer. It's a shame they aren't allowed to just close with a prayer, and it's a shame that the mere mention of "God" brings the roof crashing down and signals the end of that person's moment on stage...if we were true to the Constitution, the valedictorian would be able to say their speech and lead in prayer and there would be no uproar at all.
(My bold)
Prayer may be appropriate, I didn't see in the coverage if there was an invocation, by a member of the clergy. I would expect there would have been, it being fairly common practice.
The school board needed to act, because it wasn't merely public property. It was during graduation, in the valedictorian's speech. The admin had cleared the valedictorian's speech - which he made a nice display of trashing & then proceeded to testify & pray (I missed if he led the prayer - did the public act as a congregation, then?) & of course the school board is an enforcement agency - school districts are cases of special government, their oath of office is to the state government, not to the local populace, however constituted. The school board is required to balance the budget, ensure that licensed teachers are hired, the curriculum is taught, attendance is accurate & a host of responsibilities. One of which is to make sure the corporation does not needlessly embroil itself in no-win litigation.
The prayer did not mark the end of the valedictorian's moment, his entire speech marked that he'd broken his word, departed his script, & was flouting the framework of law that a school district operates under. The US Constitution, as I recall, doesn't even mention God by name - the rubric is something like Nature's Creator.
If the valedictorian wanted prayer, he could have arranged something with his minister or pastor, a nice observance @ church, invite all his classmates & parents & family, where of course, he could testify & pray until the cows came home - & everyone would have understood. What he did was take the podium under false pretenses & hijack the proceedings.
There are consequences for that, if any of the students/parents care to pursue them. & the school corporation is on the hook, for failling to exercise their mandated control of proceedings under their nominal auspices.