Of course. Opinions can always be challenged by other opinions. What would make anyone think it wasn't? I suppose someone could have just been walking by a random house with a loaded pistol, had a break in sanity, trespassed onto some random person's property, randomly found an outhouse and then randomly shot the occupant of that outhouse. This doesn't seem very likely. If I were a prosecutor I would do everything I could to tear any similar defense apart. Even if it were a botched attempt at theft I would still try to prove premeditation (not exactly "premeditation", in the US I believe this would be "felony murder", which usually carries the same punishment as premeditated murder) by the defense's choice to buy the bullets, load them into the magazine, load the magazine into the weapon and then head over to his robbery. They knew murdering someone was a distinct possibility and prepared himself for the act. However, from what I have read nothing was reported stolen and they even left the cell phone next to the body. It appears the sole purpose of them going to the property was to murder this man. The conspiracy charge is what I would really be interested in though. Or the red and black ones. I'm sure there are some wild purple varieties as well. Still, most are yellow.