Starmer is a safe choice for the establishment. He is actively moving the party a more big business funded model. He doesn't rock the boat when it comes to Israel and Saudi Arabia - two countries with appalling human rights and oppressive governments. He won't query US hegemony. He won't disrupt the energy companies or banking industries to any significant degree.
Let's not forget the man also lacks integrity and has large a problem with the truth. He has reneged/watered down on all his pledges that got him elected.
In summary big business or militiary industrial complex or the media would be happy with either Tory or current Labour as they maintain the status quo. Corbyn challenged this hence the ferocious onslaught against him.
Normally I exercise restraint, and my restrained reply to that is....
<sigh>
poppycock.
In the great circle of politics, at one minute to midnight you are two minutes from @mouldyboots in your hatred of the Labour Party. And I suspect Mouldy (who is reasoned, even if I disagree with him on politics) is closer to labour than you.