It is like Aesop's fable of the Farmer and the Viper

[i]A farmer finds a viper freezing in the snow. Taking pity on it, he picks it up and places it within his coat. The viper, revived by the warmth, bites his rescuer, who dies realizing that it was his own fault.[/i]

If you let a dangerous animal into your home, you cannot blame it for attacking you. It's just an animal doing animal things.