Canadian thugs have arrested indigenous protesters that were blocking pipeline construction teams from entering their land.

Under the principle of necessity, they would be justified in destroying the construction equipment, since it is being used to bring about mass murder.

Murder, per se, is not their immediate goal, but that changes nothing — building fossil fuel infrastructure will kill hundreds of millions, and any reasonable person should know that. How many of those millions would be due to this pipeline, if it is completed, is a question we don't need to answer.