Ethical questions like this are a lot easier to discuss if you take for granted that people are acting in good faith.

If you truly cared that much about Amazon and truly felt library participation was so heinous that it ought be obstructed, I think a lot of people would be very skeptical and a lot of people would disagree with that perspective, but yes, those of us who believed you were acting earnestly would indeed appreciate you standing up for your principles in a way that was impactful but not violent.

There's less skepticism of sincerity here and more agreement with the fundamental concern here, but the respect for principle and action covers both, yes.