Is it normal to have a strong interest in famous serial killers?

I once took a criminal psychology course in community college. That shit is interesting enough for them to make tons of movies and TV shows about it so you're not alone.

A lot of people are fascinated by the dark side of human nature

I totally used to be the same way. I read so many true crime books (Ann Rice was a particular fave) along with books by the killers themselves, interviews with them etc... I was totally fascinated. But then I guess I kinda grew out of it - not in a 'maturing' way but I found something else that piqued my interest & moved on. But that's just me, I tend to flit from thing to thing.
If it really fascinates u then go for it cos ur totally not alone - just don't end up marrying Charles Manson or someone on death row or anything ;)

i'm the same way!

Why though is the question?

I am the same we really should talk about it right dude come on call me okay? Huh?

Pretty much what Neuro said. We've got movies, TV shows, books, and video games all about these types of people, and people love it. You're not alone in this interest; a lot of people are the same.