What's up with daughters and their dads on crime-series TV?

There's no doubt that there's a lack of originality coming out of TV shows - there always has been.

The latest that I've noticed - in those TV series with a female cop lead, they always seem to have a dad who is a con-man or a crook. (Well, in NCIS it was Tony DiNozzo's father who was the con-man, but that's just one guy. Most of 'em...women.)

Bones - originally Bones' mother and father had disappeared. Turns out they had been spies or something. Ryan O'Neal is introduced to the series as Bones' father, who is a conman/killer.

Rizzoli and Isles - Isles character was, at one point, similar to Bones's, but now they've debased the character a bit. In any event, her dad is a con man.

Psych - Juliet O'Hara's father (as played by William Shatner) is a con man

In Plain Sight - Mary Shannon's father is a con man.

(All this begs the question, how can these people pass security checks to get jobs in law enforcement when they have dads who are crooks?)