That's a really good question !!
Military arms often have no safety devices, particularly military pistols. I think the theory is the military doesn't want anything keeping a soldier or sailor from quickly using the firearm.
Police are generally working with civilians and their own people - not an enemy, so they have a duty to be more careful. Thus, police and commercial firearms have safety devices and sometimes more than one.
Other considerations may be the environment where a fire arm is kept. Submarine's and ships don't want stray bullets bouncing around inside.
Training is always a challenge, but foremost is the requirement to use a weapon effectively and decisively in hostile conditions.
That's the take away I got after my years in the US Navy.
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