DDT is a political chemical.
For all we know, you posted something put in there by Al GOre. I wouldn't believe Wikipedia about it if my life depended on it.
Come to think of it, millions of lives do.
You are correct about that!
I've heard for years that constant exposure of a species to toxic chemicals will over time give advantage to a mutant strain that is resistant. I tend to believe this is probably true with respect to DDT since some species, namely us, aren't affected by the stuff.
So, I think regulated use that guards against reistance and environmental damge as opposed to the outright ban in place since 1972 would be a common sense approach to the issue.
DDT isn't a chemical like bleach, which nothing can survive in. If it's in low enough concentrations, some of the targets will survive, and they will be the ones who can survive low concentrations. Then their children will mostly be able to survive that low concentration, and some of the children will even be able to survive stronger concentrations. It's exactly like antibiotic-resistant bacteria. You build up a tolerance in subsequent generations every time you don't wipe out an entire "crop".