The problem is, for organizations like Greenpeace, they require that their supporters think the opponent is evil. When you can't engage your opponent on the facts, engage them on an emotional level, and accuse them of moral decrepitude -- then you'll never need to respond to their stances.
This is a common tactic on the far left and far right:
"You can't just ban all abortions, what about rape?"
"Baby killer!"
"Clearly some abortions are unconstitutional, like once the baby is viable."
"Misogynist!"
"You can't just have completely open borders, it would bankrupt the safety net."
"Racist!"
"You can't just close the borders, lots of industries rely on immigrant labor."
"Shill!"
This is a common tactic on the far left and far right:
"You can't just ban all abortions, what about rape?" "Baby killer!"
"Clearly some abortions are unconstitutional, like once the baby is viable." "Misogynist!"
"You can't just have completely open borders, it would bankrupt the safety net." "Racist!"
"You can't just close the borders, lots of industries rely on immigrant labor." "Shill!"