I believe the working theory is that both of the fathers were supposed to be testifying in the LIBOR scandal case. We're talking bazilions of dollars here. The end goal would have to be a warning shot to any one planning on testifying and talking to much about LIBOR? The first rule of fight club is, you don't talk about fight club or they'll make your family go berzerk.
Really? So the men in suits--with ridiculous amounts of money at their disposal--resort to messy, uncontrollable murder-suicide scenarios perpetuated by unstable, uncontrollable yoots as their warning?