The right to peaceful protest is fine, outside the ground, full view of media, support from across the footballing world would have followed.
However, getting into stadium, onto pitch and into areas which are off limits on any matchday, questions both the mentality of the "fans" and the readiness of the club.
Also, I don't think preventing players leaving their hotels to do their job is right either. It has been shown the players knew nothing of the ESL.