Rats and city managers have an agreement. The rats will plague the residents while the city will extract as much taxes as they can to solve the problem...while not solving the problem. It a win/win for the rats and the city coffers.
A famous deer hunter revealed that early in his hunting career he met with failure year after year, as the deer had always "outsmarted" him. Then he had an awakening. "Waitaminute", deer are dumb animals. How can they be smarter than a human." From the time forward he became one of the most successful deer hunters in America...by simply outsmarting the deer.
Perhaps these cities fail because they actually believe that rats are "smart". Rats aren't smart. They're dumb 'freaking' rodents.
Perhaps New York and other rat infested cities should consult with this guy.