Well, I can't speak for all "IDists", but based on my beliefs we are here to learn and progress: that is the whole point of our existence. Progression implies a lack of perfection, hence the wars, lack of cooperation, etc., that you suggest is evidence of a lack of intelligent design.
We are all intelligences in our own right, given the freedom to choose for ourselves and in so doing gain knowledge, experience and indeed greater intelligence. This freedom we are given means our actions can prove to be positive and conducive to progress or detrimental to ourselves or the human race as a whole.
It's commonly accepted that we learn by experience: we see evidence of that on a daily basis. Why does that suddenly seem ridiculous when it's suggested that that is what our Creator had in mind for us?