Why did the Judge let Timmy and Jimmy go ?

Two brothers, Timmy and Jimmy, were in court being charge for robbing a bank.
Timmy says that he was trying to stop his brother Jimmy from robbing the bank but failed to do so.
The judge believed him and said that Jimmy could get 5 years for this crime but he decided let them both go.
Why did the judge let Timmy and Jimmy go since Jimmy is clearly guilty?

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Timmy and Jimmy are Siamese Twins.
And since a judge can't put an innocent in jail, he had to let them both go.