Does every traffic light or change to traffic that occurs after a fatality at long time known about dangerous intersection mean that traffic light manufacturers

Does every traffic light or change to traffic that occurs after a fatality at long time known about dangerous intersection mean that traffic light manufacturers and traffic engineers collude to further their influence over shaping of our traffic? Or are people merely responding to issues as they impact society? You're presenting this with evil overtures. Sure the military industrial complex drains a lot of money from the budget. But they are responding to services needed by the government. The unfortunate squandering of money, spending money on unneeded equipment (that the Pentagon says they don't want or need) by Congress, or the lack of oversight on costs billed to the government, are other issues.