Two studies [1],[2] suggest 40% and 25% of certain violent crimes have alcohol involved.It may be difficult to know whether these crimes would have happened without alcohol anyway. Nevertheless, even a slight reduction would certainly be appreciated by the victims and society.
And what about inventing other means of social grease?
[1] https://bjs.ojp.gov/content/pub/pdf/ac.pdf
[2] https://pubs.niaaa.nih.gov/publications/10report/chap01c.pdf