How to use "vicious" in a sentence

I have a dream that one day, down in Alabama, with its vicious racists, with its governor having his lips dripping with the words of ''interposition" and "nullification" - one day right there in Alabama little black boys and black girls will be able to join hands with little white boys and white girls as sisters and brothers.

Shattered by the loss of his son, Michael had been irrationally vicious with Tina for months after the funeral, accusing her of being responsible for Danny's death

She wasn't capable of anything as vicious as this

He seemed to be utterly vicious and capable of anything.