I heard they protect the pipelines near places where it's easy to access and they know pretty quickly where the break happened so they can find you. It's quite difficult to actually figure out how to blow up a pipeline and not immediately get arrested.
There are thousands of miles of pipeline, Im not so sure.
For all their bluster, did the FBI ever find the guy(s) who shot up the substation in south carolina last year? No it isn't a pipeline, and it was attacked for dumbass rightoid reasons, but... did they ever find who did it?
Yeah but they're in the boonies. So if you go out there in a Jeep with your buddies and blow a pipeline they know where to look. It's not that it's 100% secure it's that it's secure against a lot of smaller acts of violence.