Not strictly theft, but I approve of people criminally obstructing actions which are bad for the environment. Destruction or obstruction of coal power mining/generation or smaller movements like deflating the tires of luxury SUVs.
If the law doesn't take environmental action seriously then individuals have to take control. Destroying the entire crypto market, even criminally, would be a benefit to the world.
PS: Read your HN profile: Submitting stories is by far the best way to earn karma. Comments are small potatoes.