Why did god create idiots in the first place? Just to kill them? Sound evil as fuck.
When God created Adam, he gave him a perfect environment in Eden with everything he needed. There was only one rule, to not eat from the Tree of Knowledge.
Why did God put the Tree of Knowledge in the garden if He knew that Adam would eventually disobey, and eat from it? A) Because God wanted Adam to choose to obey, and love God, rather than being programmed (like the animals are) to do X, Y, Z.
Thats a very long story short, but to summarise and answer your question bro - God didn't create idiots, Adam made a very bad decision that altered the course of humanity and lead us to the kind of offspring we are procreating now.