90% of Westminster-Fleet St discourse on the Gaza protests and the pro-Palestine movement more generally can be explained by the sheer desperation of guilty people to change the subject.

Not really. There's questions around why a green and left party might both be needed. Polanski might be very good, but it's very much a 1 man band, and many long term greens are not remotely left wing, let alone anti-imperialist. Both sides seem to be clear on the need to form an alliance.