I lived in a town where the KH had windows. Vandals threw a brick thru the big front window over, and over, and over again. Every time it had to be replaced. And every time the congregation had to pay the insurance deductable.
They finally installed a video camera, which didn't work because the vandals just broke the window when it was dark anyway, and didn't show up on the video tape clearly enough to be seen. The problem was finally stopped by neighbors who lived next door to the KH and didn't like vandals hanging around all the time, police coming by all the time, etc. They staked the place out and caught the kids who were doing it.
When they sold that KH and built a new one, it had no windows.