Most countries ( ie people in those countries ) have decided that it's generally better for everyone that protecting people and property( enforcing the law ) is left to a well regulated professional police force rather than individuals of varying moral quality, mental stability or narcotic status.

One of the ironic aspects of the situation in the US is that the fear that is used to justify the need for guns is by and large there because everyone has guns......

Very few people in the UK are troubled by the thought that they might need a gun to defend their home or person, as there is no expectation that you will be attacked by somebody with a gun.

There is also no expectation to be threaten or shot by police with guns either.