I think a major misconception about people diagnosed with HPD is that they are always manipulative and self centered in a conscious manner. A symptoms list to HPD is like labeling depression as "just sad" . The way my HPD expresses is basically a tornado of talking, lies I don't mean to say, impulsive emotions and decisions and a lot of low self esteem, regret and definitely guilt.
For example, being a diagnosed HPD, I don't actually do anything on purpose. I would love nothing more than to blend in, and to just enjoy what I have. What is so mentally torturing about this disorder to me is that no matter what I do, when I am around people it is just a automatic switch and I almost watch myself become a raging HPD!
Basically, what I am trying to say is yes, a HPD diagnosed person can definitely feel remorse, empathy, sympathy, and guilt and just about every other emotion out there! Hope I helped answer your question!!