This is based on a false assumption: that the proper police response to life-threatening criminal acts is to kill the perpetrator.
If you get past the they deserve it Puritan mentality, the ideal scenario is for police minimize death (of criminals and police officers) at all costs. Numerous other countries handle violent criminals in ways other than "kill them immediately"; the tendency of police officers to use immediate lethal violence can most likely be explained by the aforementioned Puritan "punishment" mentality, a strong culture of guns and violence encouraged constantly through the media (news, movies, and otherwise) and a myriad of other factors.
If you get past the they deserve it Puritan mentality, the ideal scenario is for police minimize death (of criminals and police officers) at all costs. Numerous other countries handle violent criminals in ways other than "kill them immediately"; the tendency of police officers to use immediate lethal violence can most likely be explained by the aforementioned Puritan "punishment" mentality, a strong culture of guns and violence encouraged constantly through the media (news, movies, and otherwise) and a myriad of other factors.