Why would a highly toxic and flammable chemical be stored in a heavily populated residential area in a state that requires special permits just to paint your fence?

An ordinary Thursday afternoon in Orange County turned into a slow-motion industrial nightmare on May 21 when a 34,000-gallon storage tank at GKN Aerospace’s Garden Grove facility began overheating, venting toxic vapor, and creeping toward what fire officials now describe as an almost inevitable rupture or explosion.
Three days later, roughly 50,000 residents remain locked out of their homes, the governor has declared a state of emergency, and the district attorney has launched a criminal probe into a corporation most Californians had never heard of until last week.
The chemical at the center of the crisis is methyl methacrylate, a volatile flammable liquid used to manufacture acrylic plastics and aircraft canopies. It does not belong within a stone’s throw of single-family homes, churches, and elementary schools. And yet there it sat for years, in tanks operated by a foreign-owned aerospace conglomerate with a documented history of environmental violations, in the heart of one of the most densely populated urban regions in the country.
This is not merely a story about a faulty tank. It is a story about regulatory drift, corporate opacity, and the quiet betrayal of communities by the very agencies and political class that claim to protect them.
Was the chemical plant built in a housing development or did developers build around the plant?