Why did Sweden sterilise up to 30,000 people against their will in the cause of eugenics?

Sweden set up a eugenics plan, grounded in the science of racial biology, between 1934 and 1976. “They wanted to get rid of a certain type of people: The weaker ones”.

Why did Sweden sterilise up to 30,000 people against their will in the cause of eugenics?
Sweden set up a eugenics plan, grounded in the science of racial biology, between 1934 and 1976. “They wanted to get rid of a certain type of people: The weaker ones”.