It's wrong to steal a purse from another person.
Mary is leaving a bar when she notices a purse sitting on a bench unattended.
Mary wants to go home.
Mary picks up the purse and gives it to the bar manager to find the owner, then drives home.
Mary picks up the purse and takes it home with her.
Mary feels good that she made sure the purse was safe until the owner could be found.
Mary is seen on security  video taking the purse and is arrested for theft.