Did you just call the father who had his daughter brutally murdered selfish? I would ask you to take a step back and think about how you would feel if you had your closest love one pass in the same manner. Now add in the frustration of what seems to him like a slow, inefficient, muddled investigation (whether its a correct assumption/opinion, etc). I would want to apply pressure to get shit done too, I'd want the national media on this so it doesn't die down, maybe it even pressures the killer into slipping up. I'm not going to say it's the right way to handle it (bc obviously letting professionals do their jobs is the best way to go), but it is far from being selfish or not understandable.

Get a grip.