Liquor reduces inhibitions and may be the catalyst but there has to be something deeper that prompts the anger that results in violence. A part of the problem may be peer pressure on men to "control" their women. How will women know they don't have to remain in a detrimental situation?
Liquor might trigger the timid male but a lot of abuse come from alpha males. I find too much focus on alcoholism in all of this. Even if liquor is a trigger there is an underlying cause because not all drunk men go ahead beating up their wives or girl friends.
Alpha men don't need peer pressure either because most men don't engage in this type of violence and huge numbers even deplore it. Evidence here on GNI. No one has made excuses for this and I think all will be embarrassed if it becomes publicly knowledge that they engage in it.