What is wrong with the US?

This boy who killed the students at VT was reported for stalking two different girls, and reported by his teachers for his writings against women. Additionally, police report that after the initial shooting, they thought it was a domestic incident. As a result, they didn';t act to try and find the guy. So here we have many instances of warnings, that nobody heeded. Why do we allow violence against women to go on, unchecked? Why aren't 'domestic' situations treated with as much, if not more, concern than a stranger being murdered? How can we change our laws or our attitudes to protect women and society from these types of crimes?