It's just a fairly typical settler nation party crisis. Systemic incompetency. The timing is a critical mass of frustrations building up and being seen as valid to air once they see they aren't alone.
Fundamentally this is the party's fault, whether it's directly through the cases of malfeasance in leadership or in doing a poor job in developing new members and building discipline through cadre. But most examples I'm aware of are real long-term members leaving over very serious issues that could not be resolved internally despite their best efforts. And there is plenty left unsaid.
If that's CIA shit then you're basically saying the PSL is CIA.