Re: "environmental terrorists"
Frankly, I find the unquestioning repetition of the phrase "environmental terrorist" to be the action of a craven shill.
Why? Because you don't like the idea?
Plod have covered themselves with something other than glory in the Gatwick pantomime, but whilst they believed that there was or might be a drone, they'd also need to be considering a motive, and that is one of a very small number of credible options.
Lets face it the tree huggers have "form" in respect of various stupid, risky and obstructive actions - climbing industrial machinery at coal power stations, gluing themselves to various commercial and government buildings, illegal attempts to disrupt fracking, attempting to stop the construction of the second runway at Manchester airport, blocking roads in London.