the rest of europe got a left-wing make-over around then, we had a real left government in france (at least at first) and also in spain if memory isn't failing me in my dotage.
britain get's its one chance at seeing proper socialism in an electorally legitimite guise and i guess the lily-livered crowd couldn't handle it.
i think it's genetic, and explains a lot about amerika, too. Fai de bèn a Bertrand, te lou rendra en cagant