Groups such as Extinction Rebellion are easy to steer off course by the state into taking meaningless actions such as gluing themselves to London Underground trains.

Perhaps this is just as well. If Extinction Rebellion really wanted to take down the entire transport network, they could do so by 'accidentally' touring the big stations with a leaky rucksack filled with lead paint fragments or ground up asbestos tiles, to then tip off the press. This would probably reveal an unfortunate truth, that there was plenty of aforementioned toxins already on the network, from brake pads and paint of yesteryear. Nonetheless, some closure for the guys in hazmat suits would be needed.