In modern UX/UI, red is universally understood to mean delete, close, stop, error, and similar "bad" or destructive things. If you localize OS X to Japanese, does the "close window" button change from red to something else? If you localize GitHub to Japanese, does its irreversible repo deletion confirmation prompt appear in green? Is the "proceed to GitHub" button at https://github.co.jp/ green or red?
In modern UX/UI, red is universally understood to mean delete, close, stop, error, and similar "bad" or destructive things. If you localize OS X to Japanese, does the "close window" button change from red to something else? If you localize GitHub to Japanese, does its irreversible repo deletion confirmation prompt appear in green? Is the "proceed to GitHub" button at https://github.co.jp/ green or red?