Different world and mentalities too.
I learned that at US police academies they spend an incredibly high amount of time on self defense instead of dealing with conflict managements.
An officer in Europe will try to desescalate a situation and use force and hard way if it is deemed really necessary,however the ways of doing of an US police officer will in most cases just escalate the situation (sometimes using totally disproportionate force in regard of the situation) and will end up with dead or injured people.
Also most European police forces don't have shoot to kill policies and strict rules in regard to the use of firearms.
In France for exemple,the number of people killed by police reported to the number of police shootings is negligible. And most of the times the people shot die way later because of their wounds.
@The Sandman