See DDT was bad for birds, but in a very short time frame we got rid of malaria in the United States.
https://www.cdc.gov/malaria/about/history/elimination_us.htm...
And we put down so much DDT that people around my age never had to deal with bed bugs till now.
I'm not advocating for spraying DDT again, I am suggesting that the history and use of DDT far more interesting than can be covered in a string of HN comments!