Crime shows are really popular, in general, but usually, at the end of every episode, you have to let go of the people that you've invested in and then, the next week, get somebody else.
You get used to falling in love with people and having to let them go.
A lot of cop shows, because they have the restraints of having a new case every episode, the victims often become these kind of nameless, faceless plot points, and as an audience we don't feel anything for those people.
I don't know how people chew gum all day long.