They have to do something like this to try and right the wrongs that they've done by effectively supporting Bea's appaling behaviour over the last few weeks.
She's been picking at someone or other more or less constantly since she entered the house.
First it was Kenny (who was an idiot but she didn't help), then Tom, then David/Lisa and then, of course, the person who had given her the most support in the house, Freddie.
She needs a proper Friday night eviction just to ensure that she gets the full brunt of the public's feelings towards her all to herself.
She'll probably still insist she's in the right though!
Beast of a girl.