No, in the end, the only person responsible for Toga becomming an insane mass murderer is Toga herself.
Noone has forced her to do anything.

Society has rules like "dont cut people against their will to drink their blood".
And she made a concious decicion to "nope, i want to be free to slash people as i please".

Thats not society's fault. Its a very reasonable law we cant do without.
In the end the only question is if she belongs in a prison or a asylum.
And to be fair, i am leaning towards asylum myself.

I mean, some people are just born crazy due to genetics. And we dont blame them.
But we lock them up if they are a clear and present danger to themselves or others.