The protests involved what activists call “direct action,” which involves trespassing on private property, blockading workers, or damaging equipment in an effort to prevent otherwise lawful activity. For example, activists admitted to setting fire to equipment and pipeline valves in an effort to stop construction: https://www.kcci.com/article/2-women-admit-to-causing-damage.... That’s legally straightforward conduct outside 1A protections.

The more tenuous thing here is proving Greenpeace incited people to do that. Without having seen the evidence, I’m guessing there were internal documents that were bad for Greenpeace. Activist organizations sometimes adopt pretty militant rhetoric in an effort to get protesters fired up. I bet these internal documents could seem sinister to a jury of ordinary people.

The legal issue here is that there should be a very high bar for saying that first amendment protected speech amounts to incitement. But that’s not a principle of law as far as I’m aware. So any organization that adopts this militant posture for marketing reasons (which is a lot of them these days) could run the risk of that being used against them if any of the protesters end up damaging or destroying property.