From the book Social Anarchism and Organization:
Social movements should not be linked to politicians or to any sector of the state because we know that when they come wanting to help, in the vast majority of cases they are looking for a “base” for their party-political interests, or seeking to calm movements, establishing their dialogues with institutions of the state. Knowing well the authoritarian conception of parties we know that their interest is always to harness social movements, be they reformist or revolutionary parties. Firstly, they participate in elections and see social movements as a source of votes. Secondly, they seek a “mass movement” that serves as a base for the vanguard that they wish to be. In this case, political parties want to lead and direct the social movements, thinking themselves superior to them and judging [themselves] to be the enlightened that will bring consciousness to the exploited classes. Often their members are intellectuals that want to know, better than the people themselves, what is best for them. Other organisations that seek to control, such as churches and bureaucratic unions also do not help social movements.
All these people should be removed from social movements because they do not defend the interests of the social movements, but their own interests. The social movement does not need bosses, leaders or people who want to use it. The social movement needs people who want to support it and struggle with it, but not struggle for it, in its place. It is a place that is legitimised by the need for survival and by the dignity that causes that promote true solidarity possess.
Forgotten Weapons put out an interesting theory of Stacked Tolerances being the culprit.
https://m.youtube.com/watch?v=3iWVs2uD1XY