What about the reverse scenario, though? Should someone who watches videos about refugee suffering be given anti-refugee video recommendations, lest they be dragged into a 'left wing ideology'? I don't see how that would be acceptable. Would Holocaust documentaries be 'diversified' with Holocaust denial videos?
'Information bubbles' have existed as long as people have had a choice of newspapers to buy and TV channels to watch. Calling for Youtube to artificially 'balance' videos seems like political interference.