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I think the low crime rate in Scandinavian countries may be attributed but three factors. The factors are given below:

1. A healthy family structure : a society that has a healthy family structure will have a reduced crime rate. The family is the basic unit of all society and as such, if the family teaches healthy values and morality, the society will be more healthy and orderly

2. High employment rate: employment rate in a country also influence the crime rate. When there's a high employment rate, crime rate is reduced because the people can earn money easily to cater for their needs.

3. Better standard of living: if the standard of living in an geographical location is high, the people would see no need to go into crime.

I think all these or some of these factors are present in most Scandinavian countries that's why the crime rate is low over there