If you have saved up all year to take a well-earned family break and your flight was cancelled because of these morons, on a scale of 1 to 10 how painful would their torture to be?
http://www.bbc.co.uk/news/uk-england-london-33503167
Seriously though, what do these cretins think they are going to achieve by inconveniencing thousands of travellers?
Also, as they have breached the perimter and entered what is (presumably) private land, why haven't Heathrow just simply removed them?