Sure, if someone looks to infect someone intentionally then it's bad and they are pretty evil BUT aside from rape cases (which would be criminal by default), it generally takes two to tango and therefore whatever intentions exist, it is still the responsibility of the other person to look after their health.
I agree with some of what you are saying but not all of it or not the same conclusion. Maybe i am just simple but if you know you have a heath issue that is transmittable than taking reasonable precautions to prevent forward transmission as you from the two people involved or at really fun parties more than 2 , know the risk is higher hence i feel it is not that unreasonable.
The out of date stuff like spitting and also severity of some laws is very unreasonable and like i said so is disclosure. Must say however spitting generally speaking is disguising.
On the rape note, I agree, but just being default criminal is not enough, take another example the case a few years ago in Holland where they drugged the victims and injected them with HIV infected blood, 12 victims- Extreme but i do want cases like this prosecuted next or on top of being prosecuted for all other offences related to the same event. (handling drugs etc, etc)
The other thought is with a lack of infection or STI laws, we see some places/nations using assault/GBH laws instead, a work around. (Offences Against the Person). I'm not sure that the lack of law, so finding cases defaulting to this general law is a good or a healthy way forward.
I'm stepping out of this one though.