Well, Labour under Corbyn has managed to perform worse in this election than Michael Foot managed to do. Will they learn from this, it sounds unlikely listening to John McDonnel.
They are incapable of leading anything or anyone out of a paper bag EXCEPT when they occasionally choose an exceptionally bright and capable leader who straddles the centre ground of UK politics eg. Tony Blair.
I think the strongest reason why the Labour Party is set up to keep failing is the ridiculous mostly-non MP committee structure it has at the top which cripples the ability of the parliamentary Labour Party (ie. its MPs) to choose their own leader and then which cripples the ability of the leader to actually set policy and lead.
No serious organisation can lead by a committee made up of people who are not actually the executives holding power (in this case the MPs). It is well known in business (ie. Its axiomatic) that effective leadership or planning or design does not come from committee decisions. What is needeed is a strong and bright and trusted leader who is chosen by the the senior executives who are actually responsible for running things and, in the case of a political body, allowing the broad membership to chose from a shortlist of 2 or perhaps a very few sanctioned by the executives (ie. the MPs) who know the person on a day to day basis ..
It is simply bizarre and stupid for Labour to let its membership override its MPs on the choice of party leader, which is how Corbyn became leader and why most of the Labour MPs refused to serve in his cabinet and why Corbyn largely ended up appointing poor quality dregs to his front bench ...
It's a totally incompetent and laughably bizarre and stupid way to do things .... and it will continue to cripple the Labour Party with useless leaders most of the time ....
It's also the reason why the Conservatives expect to keep winning most of the time. In recent decades, the only time Labour stood any chance of actually winning a GE was when it had a truly strong and intelligent leader who led on the centre ground.
Laughably, the Labour Party is now in the grip of utter numbskull loony lefties who are all tied up with Corbynism / Marxism which is based on all sorts of nonsense including being pro-Palistinian (ie. Islamic) and so anti-semitic.
The Labour Party is a disgusting organisation largely filled with disgraceful terrorist sympathisers, anti-semites, really quite nasty thugs plus quite a lot of rather decent people who are too stupid to see the problems with the party or to organise themselves into a New Labour party again ...
It's quite possible for the Tories to be in power for the next 10-15 years now if they rule sensibly and grow the economy and spread the wealth around better than occurred under Labour ...