But what if he dies or is severely injured because he didn’t have a gun to defend himself with? Is the judge held liable for his death?
That argument cuts both ways, and you’ll have to admit that (while it may not apply here), the risk of futher violent acts on the part of someone charged with committing one is higher than the risk of someone charged with committing a violent felony being assaulted by a stranger.
And... no... the court has no liability in the event of an assault on Zimmerman.