How is the tenure of judges checked by 'good behavior' a good thing?

Hamilton cites an important reason for judges to have life tenure. In a free government there are bound to be many laws, some of them complex and contradictory. It takes many years to fully understand the meaning of these laws and a short term of office would discourage able and honest men from seeking an appointment to the courts; they would be reluctant to give up lucrative law practices to accept a temporary judicial appointment. Life tenure, modified by good behavior, is a superb device for assuring judicial independence and protection of individual rights.