@ChrisMayLA6
They could have cared even slightly about losing the progressive vote any time in the last 10 years, and they wouldn't have to fear it now that it's happening.
They even had a recent clear warning: at the last GE the Greens took some seats. The seal is broken; nobody can say Green is a wasted vote now.
That was the time to understand Labour's election win came not from moving right, but disgust with the Tories, and how fragile it'd be if their "Change" slogan was empty.