But there's not(Unless you've got some examples ?).
Centrists and the labour left have opposing political views, they both have vastly different ideas for Britain. Robust debate is only possible when there is at least some consensus, which there's isn't in this case. There can't be any debate on climate change for example, when one side puts forward a mass Green state project and the other side thinks Labour planting 2 billions trees was the stuff of fairytales. And really this difference in views and reality(At this point if your not for mass state intervention and huge changes to the British economy, then you're no better than the people who are denying climate change its even happening)between centrist and the labour left comes down to both groups have a been effected by different political crisis points and as a result have come up with their own common sense.
Centrist(Who are mostly all Generation X)
- Crisis Point - Fall Of The Soviet Union and 9/11
- Common Sense - Socialism is impossible, the only game in town until the end of time is neoliberalism. So to win power and make gains for working people Labour has to accept the rules and logic of neoliberalism, give power over to ''smart'' technocrats and hope for small improvements to the system. 9/11 basically turned centrists into raging authoritarian state neo cons, who won't to play wack a mole but with counties in the middle east(Explains why they are so defensive when it come to the Iraq War and have a constant distrust of the public - ''Corbyn Cult'', Leave voters are morons etc).
Left/Democratic Socialists(Mostly millennials and younger generations)
- Crisis Point - Crash Of 08 and Climate Change
- Common Sense - Neoliberalism has been a utter failure, it offers no worthwhile future and is incapable of tackling climate change. There needs to be mass change and that change needs to be ''Democratic Socialism''(Sadly Democratic Socialism is for the most part social democracy/Capitalism with a human face).
These views are ingrained in people lived experience, it can't be change by debating.
Plus the idea of the Labour Party being broad church of ideas, was always a myth. Its political party full of different parts of the labour movement that are constantly fighting each other in the hope of making gains. What we are seeing today isn't particularly new.