Prejudice = an opinion not based on fact. Akbuk you are showing yours. Glastonbury has always been political from its inception:
The hot political campaigns of the times filter down to the festival, which expresses its sympathy by sharing its space, as for instance with the noticeable number of miners’ helmets on site in 1984 at the height of the Miners’ Strike, or the march around the site by protesters against the still extraordinary anti-rave clauses of the Criminal Justice and Public Order Act, 1994. It is in the extra-parliamentary arena that the Glastonbury political ethos is most keenly felt, though.
The main political focus for funds at Glastonbury started as the peace movement and there was a long term relationship with (CND; 1981-1990), Greenpeace (1992 onwards), and Oxfam (because of its campaigning against the arms trade), as well as the establishment of the Green Fields as a regular and expanding eco-feature of the festival (from 1984 on). The radical peace movement and the rise of the greens in Britain are interwoven at Glastonbury. The festival has offered these campaigns and groups space on-site to publicise and disseminate their ideas, and it has ploughed large sums of money from the festival profits into them, as well as other causes.
It is not just at Glasonbury (better not call it Glasto or we will have more childish remarks) either where you will find left-wing politics being discussed at many festivals. You could even sight the Hay Book festival as basically left of centre although, of course, the King of Hay was an anarchist. What a sad youth you must have had in the days when all these festivals were free. The very idea of shared space was certainly a left-wing point of view. Glastonbury was just coming home this year.
Strong beliefs do not have to mean closed minds.