"Nobody, outside the ranks of Britain’s Brexiteer ultras, thinks that ending our transition out of the European Union’s single market and customs union without having secured some kind of trade deal is a good idea. "
So it's not a "good idea". And only something ultras favour, yet Labour condone it?: Removing worker protections, environmental protections, food standards, allowing the potential full deregulation of the UK, ...
I've been thinking about it a lot and none of the ostensible reasons stack up.
Firstly - this is a false dichotomy. Starmer doesn't even need to call for one. All he needs to do is point out the danger of crashing out with no deal, to ask the government why talks are failing,
But what would one gain?
"It’s also noticeable that, while both individual firms and the organisations that represent businesses are very worried about leaving without a trade deal, they aren’t exactly clamouring for an extension either. "

What does this even mean? Is Bale arguing that polls and surveys are meaningless? That's a hell of a hill to die on.
"the only advantage that would accrue to Starmer for having called for an extension now would be the right later on to say “I told you so” – never really the most persuasive argument in politics."

This is false, morally wrong, and ignores the damage it will do to Starmer.
To the leavers he postures as one of them, content to have no extension. With his background does he really believe they'll buy this lie?
But there's a clue here as to the actual motivations for this folly....
1. Labour can only win by winning back the red wall. The red wall voters who switched to the Tories, although they will be hammered by no deal, are broadly anti FoM, pro Brexit. He needs to suck up to them, win them back to Labour.
2. Labour's factions fight like a sack of rats. The hard left despise Starmer: Perhaps he is buying their peace?
1. what the hell is wrong with Labour supporting free movement anyway? Isn't that a value Labour should be celebrating?
2. "Remoaner" - implies the author excepts the language of the gaslighter: the right wing press who will demonise Labour whatever they do. There's nothing to lose here except credibility. And by not being authentic about values, Starmer is rapidly losing his.
This is akin to disaster socialism: "once there's real damage and pain, THEN the people will rise up and destroy capitalism. That'll show 'em."

Didn't Starmer get Johnson to u-turn on the NHS surcharge for non-UK citizens? Didn't Johnson concede on proxy voting for MP's? Not exactly ineffectual.
theguardian.com/commentisfree/…