what is wrong with teacher tenure

I am often critical of The Tennessean for their superficial and biased reporting. Today, I commend The Tennessean and writer Julie Hubbard for an excellent report that illustrates what is wrong with teacher tenure. Below is an excerpt.

Seven years after reports surfaced about a Hendersonville High biology teacher having inappropriate interactions with students and using school computers to surf porn, he was working as a district janitor and collecting his $52,000-a-year teaching paycheck.(link)