Over 85% of the people who commit murder are men and the majority of the women who commit murder usually do so as a defense against men who have been battering them for years. 90% of the women in jail for murder are there for killing male batterers.
Bass, A. (1992, February 24). "Women far less likely to kill than men; no one sure why." The Boston Globe,  pp. 27.

Eight in ten murderers who killed a family member were male. Males were 83% of spouse murderers and 75% of murderers who killed a boyfriend or girlfriend.
U.S. Department of Justice, Office of Justice Programs, Bureau of Justice Statistics. Family Violence Statistics 2005.

Nearly 60 percent of boys who researchers classified as bullies in grades six through nine were convicted of at least one crime by the age of 24. Even more dramatic, 40 percent of them had three or more convictions by age 24.
("Bullying Prevention is Crime Prevention", Fight Crime: Invest in Kids, 2003)

Males cause 86% of all drinking and driving incidents.
The National Highway Traffic Safety Administration

Men who witnessed domestic violence as children are twice as likely to abuse their own partners and children than those who did not witness domestic violence.
Strauss, Gelles, & Smith, "Physical Violence in American Families; Risk Factors and Adaptation to Violence" in 8,145 families. Transaction Publishers (1990).

87% of stalkers are male. 94% of female victims had male stalkers, and 60% of male victims had male stalkers.
Stalking in America- National Violence Against Women Survey, U.S. Department of Justice, National Institute for Justice. Washington, DC 1998

In a survey of college men, 35% anonymously admitted they would commit rape if they knew they could get away with it.
Journal of Social Issues, 1981

Males are most often both the victims and the perpetrators in 90% of homicides.
U.S. Department of Justice, Bureau of Justice Statistics, Homicide Trends in the U.S.: Gender