lack of bbc balance

http://www.telegraph.co.uk/news/2016/08/22/jeremy-corbyn-kezia-dugdale-640000-voters-labour-leadership/

kezia dugdale on bbc news saying fuck corbyn right now, she has been given about ten minutes to encourage labour voters to vote owen smith - the bbc presented noone from the corbyn camp and moved straight on to islamic extremism - is this not an extreme lack of balance? a political bias? the bbc attempting to push against their least prefferred candidate? is this not illegal