That doesn't equate to voting for the antithesis of what you believe in because of one person. I might agree with you on his electability, but given all the negative press, the media campaign against his character, his ability to lead, perhaps as great a character assassination any modern leader has had to endure through the press, and yet the polls suggest his popularity is growing, the polling for Labour is growing. I don't think he'll be elected, but I am impressed of the fight he is making of this election, and the conviction he is showing in his beliefs. He isn't changing his mind because the shit hits the fan 3 days later, he's stood by it and people are listening.
Even if this voting for Labour only leads to a series of climb downs by the Tories on things like Social Care, the NHS, then I'll still consider that small victories.
I've seen no fight of note from Corbyn. He's just going about the business of electioneering in the way we would expect a party leader to do.
And with the Tories showing arrogance and ineptitude every single day, he's not been required to do any more than that to bring about a recovery in the polls.