I still remember going canvassing for the Greens in 2019. We were a mixed group of Greens and anarchists. While walking, one of the Greens rambled about how she thought vaccines caused autism and people should instead protect themselves from disease by doing crossfit.
We anarchists were horrified. Some of the Greens looked quite embarrassed at her and some of them were just blanking it as background noise.
She then went on to rant about how our anti-police sentiment was going to alienate people, and how nobody would want to work with us if we took such extremist positions.
This is my experience with grassroots Greens. I won't say that it's necessarily representative of the entire party, but I do think it goes to show that it's a party with a very wide range of opinions within it; and this might complicate any attempt to turn it into a lifeboat for the Labour Left.