Quote:
so the self defence issue is often not considered necessary because they are assuming they are going to get much lower crime.


No, there answer to "self defense with something besides a gun" is always "call the police, do exactly as the criminal demands, NEVER try to be a hero."
"the fundamental principle that a government and its agents are under no general duty to provide public services, such as police protection, to any particular individual citizen." Warren vs. The District of Columbia.