Apropos of nothing, the following description of tenure by Perry Zirkel, professor of education and law at Lehigh University, caught my eye:
Tenure is no more than a legal commitment (set by the state and negotiated union contracts) to procedural due process, ensuring notice and providing a hearing for generally accepted reasons for termination, such as incompetency, insubordination, and immorality.
Tenure’s primary purpose is economic job security, tied to the otherwise uncompetitive pay in comparison to other professions; however, tenure is not a lifetime guarantee.