If you or I were this little girl's father, I daresay she would still be alive.
I translate your statement to mean: If you or I were this little girl's father we would have stayed home with the kids rather than leave the kids home alone. If you or I were this little girl's father we wouldn't have partied in the garage until 3 a.m.. If you or I were this little girl's father we would have investigated the open doors and alarm signal. If you or I were this little girl's father we would have checked on her before going to bed. If you or I were this little girl's father, we surely wouldn't have been so NEGLIGENT as Danielle's father was that night.