I disagree. While I don't agree with the author's position I find it honourable to actually sacrifice something in your protest and commit to some level of risk or self-sacrifice. While its all very nice to gather your friends and stand around with placards for a day, often you're barely risking or sacrificing anything. A cynical assessment would be: "you're just hanging out".

The author isn't hanging out and specifically introducing consequences to those they wish to punish for actions they don't agree with. If more people protested like this we'd see more social change. But people don't like to risk or sacrifice; so we don't. People who reject ethical positions often do not face social consequences.

Consider a world where owning an SUV carried a significant risk that it would be vandalised. People would buy them less and there would be less co2 in the atmosphere due to those willing to sacrifice themselves by spending time in a jail cell for their acts of vandalism.