There are numerous fetishes Halsin represents and some people find him hot. They don't care if the situations makes sense. They like that it's a porn game. Some people are very shallow.
When we bring up an issue, they lose their minds and become very protective.
There are a lot of points that can be discussed around this situation like behaviour out of character or lack of agency in solo Halsin's romance ending, but 1 point is just undeniable in my opinion is that you cant stop his "advancements" by outright telling him "NO"(other than killing him somehow).
