No wonder your father was pissed off, maybe he was scared you might be admiring those people's crimes, or something
Forensics sound very exciting from the outside.
I once met this girl who worked in forensics, and she said that it was quite less glamurous than on TV. They get a request to check this and that, they do it and they fill a report, and most of the times they don't have a general overview of whatever the case is.
She thought the upside was that her patients never complained about anything - cut, slice, poke, whatever you do they're fine xD
Profiling though, I suppose you really need to know everything and anything about the case to be able to do your job.