OK here’s my summary:
People on the left have a belief that they have the moral high ground. Therefore anything they say is correct and other views can safely be ignored and if people disagree they may need to be coerced, for their own good (Monbiot fits very nicely into this mold).
New Labour however threw out some of the old lefist ideas in favour of pragmatism in all things, coupled with an almost touching attachment to managerialism , central control and management consultants.
What you are left with is a government that has no clear idea where it is going but really does believe that whatever it does and says must be right, by definition, and therefore cracks down on any dissent, first within the party and latterly within the country as a whole. So, civil liberties can be taken away or ignored because it is for our own good. What is in Labour’s interest is in the country’s interest, the two are conflated in the minds of many senior Labour politicians. The left wing ideals have been thrown away and all that remains is the authoritarianism.
They are past their sell by date.