Every book I have ever read about communist countries has a recurring theme - suspicion and paranoia.
Whatever utopia they are trying to achieve is constantly sabotaged by dark forces working against them.
Not just capitalist countries but enemies within. Trust nobody.
When people in the Labour Party talk the same way, it makes them sound like communists too.
I am well aware that MSM hates the Labour Party. They are not hiding in the darkness, they are out in the open and it is a disgrace how much influence they have.
Similarly there were opponents in the same party as Corbyn because FPTP forces them to be.
So yes, there were people who opposed Corbyn but that was known from the start. It does not mean everyone was against him.
The Labour Manifesto of 2017 seemed reasonable enough. If a different leader had offered up the exact same thing, it might have done better.
The main objection to Corbyn was not that the party was too left wing. It was the clumsiness, dithering and amateurism that caused the problem.
Too many people thought Corbyn was too incompetent to be leader.
In fairness, Johnson is equally incompetent but he is a snake oil merchant and simply better at fooling people.