EDIT: Which is bad reason, but at least an understandable when it comes to foreign policy. And it is not that arms exports are actually hindered by morals, all the exports to Saudi, UAE, Mexico and every other crisis region show otherwise. Personally, I think the West shouldn't export to those countries or conflict zones. The West also needs the industrial base to maintain reasonably strong militaries so, and with defense spending being a less than popular thing after the Cold War ended, exports are necessary for that. This could change so, and already did in Germany with additional military spending.