Because of the intolerance around sex and gender issues. Not too much of a surprise - I think he’s always been pretty gender critical but fighting to keep his mouth shut because he feels he has really important work to do. But the Scottish Greens make it more or less impossible to be in the party if you don’t cheerlead every single accepted view. His loss is a real blow to Scottish politics. I’m so angry with the SGP for chasing him out.