You'd rather they join the general dating population? These are people who realize that they might have done something stupid (I'm leaving out the innocent spouses who caught something from their cheating marital partner) who want to make sure they don't pass their infection on to someone else.
To me, this is being responsible.
I know, I know. But it all seems so, ah, dreadful.
Seems to me that it's a swinger's website disguised as a "responsible" website. Not that I'm being judgemental.
A responsible person who is dating would say at some point early on in the relationship, "Hey, I have herpes."