Is this really true? The few years I worked 'a door' almost all violence was male on male. I find it hard to believe that domestic violence would make up the rest.
It does stand for further analysis, and we are hampered by what is reported - male on male rape may be far more prevalent than we'll ever know, perhaps.
We are also hampered by the variance of the impact, how do we measure the psychological impact of being attacked? It's hard to be objective. But it is generally accepted that for a given act of violence the impact is greater on a woman
But on what we have - reported events, impact and damage caused and so forth, then yes, it is really true.
Male on male aggression - and this is going to be tricky to argue I realise - is to some degree part of being human, and I'm referring specifically to your experience working doors. Men have a need to establish a pecking order, particularly in front of women - and backing down at a night club in front of potential mates will happen if two suitors, or groups of suitors, appear evenly matched. Alcohol doesn't help, but isn't truly the underlying cause, it's the accelerant.
A man involved in a street fight such as this is more likely to have a say in whether the fight actually occurs or not, and to be psychologically prepared for success or defeat. But that is not to say it's okay, we collectively don't want this to happen so we created laws against it, it is to differentiate it.
A good place to start, though fifty years old, is with
On Aggression by Konrad Lorenz:
http://www.amazon.co.uk/gp/aw/d/041...aggression&dpPl=1&dpID=51Oknk1f6fL&ref=plSrch
I read this around age 14, and infraspecies aggression immediately became part of my lexicon.