DDT was created as an insecticide to prevent the spread of deadly diseases and to help farmers grow more food. DDT did not cause any "horrible death and destruction".
The only horrible death and destruction that DDT caused was to insects. One of its side affects was to soften the eggshells of birds (most notably the Bald Eagle) who ingested DDT (through eating insects with DDT on them, or rodents who ate said insects). But, this was something that was discovered (by SCIENTISTS, btw) decades after DDT was introduced, and there is no way the people who invented DDT could know about that.
I suggest that before you condemn people, you do a little research, and not just blindly believe those with an agenda to push on you.