The Bilco Company makes "access products," meaning doors, windows, roof hatches, floor hatches, et cetera. But in a sad sign of the times, they also produce devices designed to prevent access: Mechanical objects that can "lock down vertical doors in a matter of seconds in active shooter situations."
It's kind of a strange situation to have to make products that prevent the functionality of your other products. But that's the world we're living in now. While your chances of being killed in a terrorist or terroristic incident are still infinitesimally small, the desire to be prepared—or plain ol' pure fear—will always create a market demand for security products.
From a business perspective, security products seem like a good area for a design entrepreneur to step into. A guy with a background in Sales once told me that the key to closing a sale is to make the customer feel as if there's a deficiency in their life, and to convince them that buying your product will eliminate that deficiency. Which means that in the security product market, the media is your free advertising and salesforce. With each incident that they publicize and occasionally sensationalize, the message coming from our news outlets are all designed to reinforce the notion that we suffer from a deficiency of safety. I expect products like these to proliferate.