I don't think it's exactly a good thing that our prisons are so poorly managed that people can easily random suffer extra-judicial violence, and I certainly don't think it's something to celebrate. Sure, today it was a total piece of shit, but circumstances that enable this kind of disorder, combined with our less-than-perfect justice system, mean that tomorrow it could easily be someone who was falsely arrested and shouldn't even be in prison that gets stabbed.
That said, I certainly won't shed any tears for Larry here.