Oh look, yet another burner account.It seems the electorate views this type of defection as unprincipled, and it either has no effect or boosts the popularity of the party that lost the MP.
Personally I'm glad to see this guy and Watson go-in Watson's case it was clear he was briefing the press with smear stories.
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Corbyn intervened personally to prevent Watson being removed from the deputy leadership by Labour members at the recent conference. Not much of a purge.
I presume Watson is going primarily because he is going to lose his seat if he fights another election, though there may be an element of sabotage given his history.