Even in countries that have maximum prison sentence length, people who are considered dangerous are still not let out into the public. They&#x27;ll stay until they are considered rehabilitated. For dangerous people that have mental health problems, they don&#x27;t get a prison sentence at all, but they will be forced to stay in a treatment facility until they are no longer dangerous to others.<p>At least that&#x27;s how it works in Finland. The whole system is designed to get people to become productive and healthy citizens with minimal suffering, not to provide retribution.