Two possible problems:
1) It might hurt tracing efforts if people are worried about being prosecuted (ie. people "clam up"). For example, this particular story might not be known at all. Hurting tracing harms public health, so this might be a good enough reason not to go after irresponsible people on the basis of tracing infections at all.
2) I'm not aware of the law ever holding anyone responsible for non-deliberate infection. New legal ground would have to be broken in this area.
[1] first google result I found. https://www.amnestyusa.org/issues/death-penalty/death-penalt...
The professor(and ordained priest)'s conclusion was the following: "Most Americans believe in Hell, but none of them think they're going there."
Unfortunately a lot of these people really don’t believe it is harmful. The ones who have mislead them on this by intentionally spreading misinformation are probably better targets for any kind of culpability.
[1] https://en.m.wikipedia.org/wiki/Criminal_transmission_of_HIV...