Whilst I'm open to the idea of free speech, these clowns need to get real and take their frustrations out elsewhere. Whatever damage has been done to the planet is done - by humans or not - and causing disruption to flights at any airport is not going to make the slightest bit of difference to their case.
I say if these protesters are arrested, and they should be, they should be banned from flying for at least 5 years, maybe more because at the end of the day, do these people really not use aircraft themselves or do they walk everywhere ?
I heard over 800 arrests have been made. Charge them, fine them £5k each and put the money towards the cost of policing them.
And, get a job too whilst at it.