Self-Defense Suspension

My husband has been using gyms for over 20 years & been a member with Virgin Active & Planet Fitness Bryston & Melrose Arch. We have NEVER experienced what we did. We spoke to staff & management a few times explaining that people do not know how to use the super circuit. Someone who did not know the rules asked my husband to vacate the equipment he was using. My husband did not, and referred him to reception, to be explained how it works. The man persisted & insisted he moves. Eventually the man started pushing my husband, I came in between & he still kept pushing. He started hitting my husband & they dropped onto the stepper. My husband defended himself & is now suspended from the gym. Gym patrons & staff were witness to the incident. I requested that the manager views camera footage. To my surprise, there were no cameras at the super circuit. Alida and Karen Gordon said that he is suspended as he was in a fight. My question is this: Do you suspend people who were defending themselves & tried to avoid it? We made a few requests to have clear usage signs prior to this when we saw problems & reported it. Even now after this, Alida showed irritation when I requested this. FAIR?