Allowing homeless people into your home is dangerous.
George has befriended a homeless guy who camps out on his street, even as a blizzard is coming their way.
George wants to help the homeless guy.
George takes the homeless guy to a homeless shelter.
George invites the homeless guy to stay with him in his house for a few days.
George is safe in his house.
The homeless guy gets high, gets in a fight with George and hurts him badly.