That’s not the only reason. By purchasing a ticket and entering the ground, and by way of the associated statutory CCTV notices, attendees expressly consent to their images being used (and disseminated) for (inter alia) crime detection purposes. Much the same as you and I consent to our images being broadcast on Match of the Day when we purchase a ticket.
So, there is nothing in law preventing the club, in conjunction with GMP, disclosing any images of suspects to the evening news (and more widely). To suggest otherwise could lead to absurd outcomes and would defeat the principal purpose of the CCTV system within the ground.
I have significant experience in dealing with CCTV footage and systems and it is inconceivable to me that with sufficient interrogation of the system’s hard drives, that it would not, at the very least, give rise to suspects being identified.