"Common" Sense

A Texas school district is planning to let teachers bring guns to school:

The board of the small rural Harrold Independent School District
unanimously approved the plan and parents have not objected, said the district's
superintendent, David Thweatt.

School experts backed Thweatt's claim that Harrold, a system of about
110 students 150 miles northwest of Fort Worth, may be the first to let teachers
bring guns to the classroom.

Thweatt said it is a matter of safety.

"We have a lock-down situation, we have cameras, but the question we
had to answer is, 'What if somebody gets in? What are we going to do?" he said.
"It's just common sense."

Clearly this is a new and rather different definition of "common sense" of which I was previously unaware.