Inviting a wolf home 引 狼 入 室

There is this Chinese saying about inviting a wolf into a hen house, 引 狼
入 室. The consequences are obvious when it happened. The big question is
why would people be so silly to invite a wolf home? Little Red Riding
Hood did that and was nearly eaten. Why did she do it? The wolf dressed
up as a grandmother, all weak, hapless and needing kindness. She was
taken in, she was duped.
 
What is the