Van Goth HIV disclosure

I know this will probs get downvoted, I mean no offence at all i'm just a bit confused/uneducated as to why Van Goth and the other queens were saying that it is wrong that people with HIV must disclose they have it to the people they are sleeping with. This to me is absolutely standard and should absolutely be illegal if not disclosed. Again sorry if I've got it totally wrong, I was just a bit taken aback