This... afterthought.
An agent for change. The only one.
Reversion to a simpler time, with nicer values
That didn't actually
Work
Even then, leave alone now.
He will win.
But...
He is Labour's Messiah
By default.
Well written, my only hope now is that you have terrible dress sense.
There's more than just nostalgia for the old ways, British political parties have never been warm to Israel, they were never truly forgiven for the insurgency between 1944 and 1947, but a shadow cabinet under Corbyn is likely to be the most openly hostile.
The potential withdrawal from NATO is another example, and there's the National Education Service modelled on the NHS although you'd be forgiven for thinking that's just a new name for an old hat.
According to many critics Corbyn is so left-wing he would make the Labour Party unelectable, but as Roger pointed out rather well, didn't the 2015 General Election already establish that Labour's current policies did exactly the same thing, made them unelectable.
And, back to the original question, on the rationale behind changing your policies [and by association your beliefs and principles?] based on improving the likelihood of achieving political power rather than challenging debate. Are we now so miserably desperate for the middle ground that rather than finding it morally bereft, it is openly discussed, admitted and even boasted about?
Gradually the colours of our lives are fading to grey.