Why Internet Explorer checkbox accepts double click but changing state only once?

While I was working as system administrator in many different companies I've oftentimes seen people using doubleclick as default action to interact with any UI element. The first thing they learned about Windows, is that doubleclick launches an icon (shortcut). And they apply this knowledge to every other elements, no matter what it actually is: link, button, icon or checkbox =) So, I suppose it made deliberately, that IE counts doubleclick as singleclick.