Why are atheists and creationists so stubborn?

I have noticed nearly every atheist I have seen or met, is just straight up cynical, and ignorant of any possibility of a god. And creationists absolutly refuse to beleive any science, except for thermo dynamic miracles, just to prove atheists wrong. Why cant people realize no one has it completely right, and we all see the anwser from strange angles? And why are most atheists such jerks to creationists?