Political parties are always terrible on scandals they might be implicated in, even historic ones.
Look at the Lib Dems. I don't think they've got anyone still alive and active who was involved in the Jeremy Thorpe scandal, but through keeping silent about it for decades while Thorpe became a forgotten figure, they've managed to avoid owning up to the fact that every senior figure in the Liberal Party knew about Norman Scott, and almost all of them were involved in one of the many schemes to shut him up.
Cyril Smith was worse, and lots of his enablers are still around, but they got the ancient David Steel to be the sin-eater for the party, and go off disgraced into retirement, while nobody else had to take any responsibility.
This is far bigger and far worse. It might be the worst scandal for any British party in history. And Labour have every incentive for wanting the inquiry to fail, because dozens of Labour MPs in the North and Midlands depend on votes from a Mirpuri community who will shift in an instant to Corbyn or Galloway or some other vehicle if elders tell them the community is being victimised.
If we take recent polling seriously, Labour are at risk of being wiped out in Birmingham, with mostly Muslim areas voting for Corbynite candidates and all the other areas going to Reform. I assume Jess Phillips can read an opinion poll.
But the more Labour go into coverup mode, the worse it gets for them. I think Shabana Mahmood understands this. I don't think Jess does.