You reduce opportunity which gets rid of opportunistic criminals. Ones who might rob your house <i>because</i> it is unlocked and they are less likely to get caught (compared to the shattering of glass or breaking down a door).<p>I&#x27;m going to go out on a limb and claim murders are <i>not</i> an opportunistic crime. People are not killing because they <i>can</i> and <i>can get away with it</i>. The comparison you are trying to make dies there because the type of crime is not comparable.