You're not under the impression a random pipe has sprung forth from the ground like spring grass are you? No? Then the source is obviously wherever the pipe starts.

You're calling for violence, use your brain the math on this one really really isn't hard and I've basically spelled it out for you as much as I can without causing legal issues for myself.

You're assuming there's immediate harm, you can't commit a crime and use the excuse that they did it first. The only thing you'd be doing is committing a felony in basically every state, what they're doing is also potentially felonious but you need to prove that first and seek civil solutions first to prevent getting yourself a one way trip to prison.