Is Question Time Biased?

This is another clip from Question Time, The question was in relation to the Rotherham/UKIP fostering row...



Video via liarpoliticians

Some will say to make sure of balance in the audience while other would say it means they can have a biased audience....

Now if we go back back to this Question Time  and watch and listen it seems the audience are more pro Palestine than Israel


Video via liarpoliticians

So i thought i would have a look at a poll (disclaimer, it is from earlier this year) ,

     "Pro-Israel sentiment in the UK has dropped from 25 per cent to 17 per cent in a decade, while support for the Palestinians remained at the same level at 18 per cent."

So, according to the poll both sides have roughly the same support ( 17/18% ) yet according to Lady in top clip the BBC check political agenda of people, so why did they seem to have a biased audience in the Israel/Gaza clip?

Biased?