Sweden has a long and revolting involvement of medical experimentation and eugenics on its own citizens, such as unconsented sterilisations, or feeding mental health patients diets designed to induce tooth decay so they could study the teeth rotting in the victims (I will not describe those so afflicted as patients).
In this context, the decision of a prominent Swedish scientist to "go it alone" and experiment on the population who have entrusted themselves to his care is unsurprising as well as tragic.
(And an actual brilliant scientist learns from their results and modifies their hypothesis. He seems to have done very little of either.)