This is a plot summary from Wikipedia of the third episode of Mr. Robot:
at the party, fsociety leaks Evil Corp's emails that incriminate Colby for covering up a toxic waste leak which caused leukemia in Elliot's father and Angela's mother. Elliot returns to fsociety.
Why did Elliot return to fsociety? Is this because he doesn't want Colby being sent to prison? Why couldn't he just continue his new "normal life"?