It’s an arbitrary distinction between two groupings that are too broad to meaningfully judge.
There is also no point or honor in judging on its own. If you dislike Greenpeace’s approach, find another approach and devote yourself to it, put your money where your mouth is.
Activism is in reality often a choice between choosing the least worst strategy in a context where you have limited power and control, and any decision you make will alienate someone. Particularly the armchair-sitters who believe they are “in the middle” and who’s only contribution tends to be saying empty things like “I believe in their mission just not their tactics” but don’t put forward a practical strategy of their own. This applies to most activism, particularly direct action.
WadeTheWizard