Original sentence: Otherwise, treatment has to be denied until after violence happens.Their condition impairs their brain function, and since they do not think they are sick, many of them do not actively seek treatment and often refuse it
Edited sentence: Otherwise, treatment has to be denied until after violence happens, presupposing that all lunatics are violent.Their condition impairs their brain function (as "proven" by the fact that they reject treatment), and since they do not think they are sick, many of them do not actively seek treatment and often refuse it