I’m not super familiar with Eccleston’s politics but he had some amazing stories while in the Tardis and what he has spoken of his leaving the series, which has been entirely backed up by everyone who spoke about it after, was entirely due to mistreatment from higher ups to the little people that make the show work.

Maybe I have a huge blindspot but I don’t see much reason to get mad at him when he brought up some legitimate concerns, and his departure was a catalyst for conditions improving.