People who try to defend such harmful behavior may be trying to fight identity politics and radical feminism, but it's very counterproductive towards that. They're just confirming that what feminists say is true.
I have had some experiences with women where things seemed to be going fine and then I was abruptly blocked or ignored, and it was very frustrating at the time because I had poor social skills and I didn't have a good understanding of what had happened or why. Now I understand that dating is often asymmetrical and one person just may have many more options than the other, or just decide they are not interested, and that's OK.
This seems like it could be a very extreme case which got way out of hand and the guy went off the deep end, but I think it is best to at least try to have some understanding of and maybe some empathy for both sides.
I think the same thing can happen to women who are pursuing men, and it can also become extreme, like the woman who broke into David Letterman's house. Should you just call her a creep and throw her in prison, or should you feel empathy for her mental illness and try to treat it? It seems to me like the best solution is to determine and treat the actual cause of the behavior.