But almost anyone with a short fuse during arguments and access to a gun could.
(EMAWmeister and SB with a 1-2 clown shoe-ing of HeinBallz right now.)
Then again, I guess Javon Belcher (who clearly regretted his impulse) and others like him would still get the job done if they didn't have quick and easy access to guns. All they would need to do to satisfy their rage to murder their girlfriends would be:
1) get out their laptops and connect to the internet
2) pull up Uhaul.com
3) wait for it to load
4) figure out what type of truck they would need
5) book that truck, most likely a few days later
6) drive down to their nearest U-Haul pick-up station
7) fill out the paperwork
8) drive it home
9) get back online and somehow locate a guy with a ton of fertilizer for sale around downtown Kansas City
10) negotiate a deal with that guy
11) learn how to build a bomb
12) leave the big city and drive out to the guy's farm in the U-Haul
13) load up all the fertilizer
14) drive back to his girlfriend's place
15) detonate said bomb to kill girlfriend over the argument that made him mad four days earlier