You have to realize that even though they can be very accurate with practice, that they do take a lot of practice and trigger control. The smaller the gun, the harder they are to be accurate. The site picture is shorter, and the barrel is too. How many rounds did you put through the SR9? Your father is right, most interactions happen with in 7 yards, and chances are they are within less then 10'. You don't need to be driving tacks with the gun at 50' its a handgun NOT a rifle.
The LC9 if hammer fired.