It seems they were very disappointed in their Idol.
There was no room for understanding or forgiveness.
He just didn't do as they expected him to do.
So, they need to make sure no one forgets his mistakes.
I'd hate to be held to the standards they inflict upon others.
Makes one wonder how "perfect" or rigid their life is.
It's too late for Elvis to be "normal".
IMO, it's these same folks that would never have paid any attention to him in the first place, if he was "normal" or mediocre .

So, for his "differences" that drew them to him in the first place;
he can never be forgiven because he didn't live up to their expectations.