Your case is that the culpability for Swartz's death rests solely with Swartz. Swartz's friends and family have asserted with unanimity that Swartz's life was dominated by this prosecution. Ergo, the series of events culminating in Swartz's suicide would not have happened had he not been prosecuted, or, more importantly, prosecuted in this particular way.
When you assert that Ortiz's office is not culpable, it sounds very much like you are contradicting the prosecution's role in Swartz's life and death.
I try really hard not to be one of those laymen that regards all lawyers as soulless, but this right here is the kind of thing that leads to that opinion of the law profession.
"But they handle tens of thousands of cases" should never be used as a defense in the death of a litigant -- a person. At the very least, the death of a litigant should force all parties involved to examine their actions and see if they might have been able to do anything reasonable to prevent it. Justifying it in the abstract, saying essentially that it's OK as long as it's not too many, is despicable.