Absolutely, and I feel as though my homicidal ideation was exacerbated around the time Sandy Hook happened. I was about 14 years old, but I had fantasized about how I would execute a mass shooting at my high school... Don't really think about it as much any more, but, there was a time where I did think about lashing out somehow at the moronic, worthless scum I had to force myself to be around almost every single day.
Acquiring guns where I live is near-to-impossible nowadays (Thanks Martin Bryant!), so, it was probably never going to happen anyway.