Depends on your average. If you take mean then male averages are always skewed by outliers. The mean number of people murdered is going to be higher for men than for women. But the median and mode for both will be 0. Also note that such statistics have a lower limit (0) but no upper limit. It might be that there are men who are overwhelmingly "good" and prevent many murders, but this won't count as a negative contribution to male murder statistics.