Well hang on just a second. The shadowy world controlling establishment that control the papers, media and everything else have actually let people know about Labours policies to the point where they are mainstream? Not a particularly good establishment are they?
Your whole point is that there's some shadowy cabal controlling the political strings in this country which will rub Labours face in the dirt. There isn't some people have a different opinion and have left. That's it. You seem to think its a contrived plot to destroy Labour.
I'm not sure if you are familiar with the works of Nikos Poulantzas who writes eloquently on this area?
Both your point and the alternative viewpoint can be true at the same time. To me there is little doubt that there is a distrust of Corbyn as PM and there is some coordination of this. You only need to see the aftermath of events like Hillsborough to see the ruling elite can act in a very cohesive and disciplined way when it chooses.
However it's rarely as simple more broadly than that. While the media are broadly antipathetic towards Corbyn it's not universal. I think the Brexit debacle is also quite demonstrative of an elite (in so far as one exists) actually finds it very difficult to hold a united viewpoint on most things and you have a range of competing interests. There is no doubt, sections (albeit minority sections) that I believe feel a Labour (if not a Corbyn) might provide some way out of this mess.
I don't think this is singularly a wrecking operation. I'm not sure the world works in such a machiavellian way. The Labour Party to me is suffering from the case that it is 2 parties in 1 currently. Once you move beyond the accusations of anti-semitism, war mongering, privatisations, marxism or anything els that either side lob at each other the core difficulty is you have 2 different philosophies at the heart of the party. Eventually a section of those in one section of the party have decided they wish to leave. Good luck to them.