I don't know where you got the information that Corbyn was given more time than Starmer when he faced a leadership challenge almost immediately. As for him doing zero against May, I have never seen such a concerted effort to destroy a political figure in my life, from the newspapers, TV, the right wing of his own party and the Board of Deputies. The lies and slander that that man faced were totally off the scale.
But the far left of Labour are undermining Starmer before he's even had a chance to have a GE, or get anywhere near one.
Also, they're paying absolutely zero attention to the massive vaccine success, and the effect it would have on voter numbers.
Also, they're paying absolutely zero attention to the "massive brexit success", and the effect it would have on voter numbers, it's a fallacy I know, but the voters labour lost don't think that way
They whine about "no opposition", when the people they need to win back are the exact same people saying we need to "belive in brexit", I know the latter is a fallacy, but the people who labour lost do not want to see labour and their voters going absolutely mental during a pandemic/ crisis. They expect labour to be pulling in the same direction or some other hor$eshit. It's messed up, but it's how they think.
Of course he was destroyed by the media, the media is far-right and Corbyn was further left than previous, or at least perceived that way. Did you expect him to get an easy ride?
The media are a bully, and although I hate that I have to say it, Starmer will be much less of an easy target, and at the minute I think he's largely keeping his head down on purpose. It's a messed up situation, but in order to fix it, we have to realise it is messed up. We have to stop being a target for the bully and then go after them once we have some more strength (or when they are weaker/ more vulnerable).
Blair took a beating by the media, and gets it even more now, and that's by the tories and the tory press, largely due to a war that the tories wanted and all voted for!
You need to know your voters and your enemy, and you need to know what the current makeup of the population is.
At the minute it's further right than all of the other parties seats combined, going further left is not going to be a win, it will be bigger loss. It might be morally better but morals mean nothing, when you've not yet faced reality.
The current split is temporary also, it's a fake split as we know the tories are riding the crest of their wave, and we know how crap they are and how they will start in fighting again. Just let the wave break and take the opportunities that arise, and they will.