Were the Greenpeace runabouts observing maritime safety rules such as avoiding collisions and giving way? Any protester that behaved like that in a car would be immediately arrested and charged.
Why it is tolerated in the high seas is beyond me when it would never be tolerated on the road. No one would pretend reckless driving was peaceful protest. Is it okay to behave recklessly in a boat? No one would accept that in a car on land.
Central to the notion of peaceful protest is fidelity to democracy and the rule of law. The idea is not to impose your will upon others, but to persuade the majority to reconsider their position by showing the passionate extent to which you disagree with them and honestly believe they are mistaken.
The civil disobedient is attempting to appeal to the “sense of justice” of the majority and a willingness to accept arrest is proof of the integrity of the act says Rawls:
…any interference with the civil liberties of others tends to obscure the civilly disobedient quality of one’s act.
Rawls argues that the use or threat of violence is incompatible with a reasoned appeal to fellow citizens to move them to change a law. The actions are not a means of coercing or frightening others into conforming to one’s wishes. That is a breach of the principles of a just society.
Utopia, you are standing in it! 
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