This is a very good hack and also a reminder for Western countries and political actors that these kind of break-ins are not necessarily criminals acts but may be political demonstrations. If a break-in is non-destructive and has as motivation a political demonstration, in a democracy it should be treated as such and not be brushed aside as "criminal".
If I broke onto an MoD base in person, no matter how little damage I did or how much my motivation was politically driven, I'd be arrested pretty damn quick. And I'm talking about countries like the UK/US, not Syria.