I think you have got it the wrong way round. Starmer focusing on a party purge instead of targeting the incompetent government is letting them get away with murder.
You also underestimate the fact that the previous GE was unique in that it was dominate by Brexit election. Now that is done, there is potential for a swing back to more normal, historic voting patterns in pro brexit constituencies.
Starmer has no choice; all the power resides with the Government on virtually every issue they have a majority of 80+, its possible he may dint that majority on the odd issue, but otherwise he (and Labour) are merely spectators. He now needs to concentrate on getting his own house in order, so he can mount a challenge further down the line, who knows, if with a 'night of the long knives' (
to borrow a phrase from the past) he really steps it up and/or Boris manages to lose the Tories, (
not completely unthinkable) he (
just)might reduce the massive Tory majority at the next GE.
Sorry, I don't see any potential to return to pre-Brexit voting, the 'remain v leave' issue split the country top to bottom, across all parties, unfortunately for Labour it more than decimated their vote. Lots of pent up anger in red wall seats. Labour, even when in power did nothing for many of these towns, assumed their votes, used them as cannon-fodder, Brexit was merely 'the bridge too far'.
If Boris and/or the Tory party does manage some sort of 'leveling up'in these areas, Labour is doomed...doomed ah tel yer!
I don't think the evidence is there yet that he is going to do that, but if he is we should find out this autumn. I hope he will anyway.
Agreed it just seems to be 'sabre-rattling' just now. However if Starmer does really want power, and not just standing on the sides lines shouting, then he needs to grasp the nettle.