Probably based off of some of the origins of tenure. WAY back when they used to fire teachers (for example) when they got pregnant. Nowadays it's protection a

Probably based off of some of the origins of tenure. WAY back when they used to fire teachers (for example) when they got pregnant. Nowadays it's protection against (for example) teaching evolution in biology class (which isn't popular in some districts) or "Catcher in the Rye", etc. That all being said there's a reasonable list of pros and cons here: http://teachertenure.procon.org/ http://teachertenure.procon.org/ EDIT: I should qualify I meant when tenure was coming into K-12. It was originally based off of the professors and the boards of trustees in the universities.