Are there always signs?

So, it turns out, as it always seems to, that the good-guy image of the abuser/killer had undertones there all along. Oscar Pistorius, now charged with pre-meditated murder in the shooting death of his girlfriend had a fascination with guns, which, among other dangerous tastes was detailed in a story written one year ago by acclaimed sportswriter, Buzz Bissinger:

When it comes to Pistorius, go back in the archives of The New York Times Magazine to January 18, 2012, and read the piece by Michael Sokolove, for my money the best long-form journalist on sports in the country.

Sokolove clearly liked Pistorius. He also showed a side of the man that Sokolove ultimately dubbed as an “adrenaline freak” (although an out-of-his-mind freakin’ danger freak would have been more accurate): a penchant for driving cars 155 miles per hour on roads with standing water; the crash of his boat that required 172 stitches; a keen interest in guns and shooting, keeping dangerous animals as pets.

http://www.thedailybeast.com/articles/2013/02/15/the-unwarranted-mythology-of-oscar-pistorius.html

 Pistorius and his girlfriend had only been dating for two months. What kind of tempestuous dynamic falls into place in such a short time? Its hard not to argue that Pistorius' dangerous interests were a sign of darkness in his character?