The BBC is a public service broadcaster paid for by British taxpayers. Its credibility and legitimacy depends on it being seen to maintain strict neutrality and a commitment to evidence, not become a media attack dog in the hands of the ruling party.
The question is why did the BBC's flagship political investigations show decide that the marginal problem of racism in Labour was a much more urgent matter than the provable and significant racism in the Conservative Party?
Unlike Labour, the Conservatives are actually in power and, through policy-making, are in a position to improve or damage the fabric of life for minority communities in Britain.
This isn't about protecting Corbyn. It is an expectation that the BBC sticks by its commitment to assess dispassionately British political life rather than interfere, as it did with the Panorama special, in an overt, partisan manner.