I think sometimes some people are destined for gear up landings. I know of a case of a pilot who did a wheels up landing. When questioned about whether there was a gear warning horn, the pilot replied "There was a horn but i disregarded it because i thought it was a faulty stall warning horn"!
The manufacturer cannot build "common sense" into the aircraft, so sometimes all the bells,whistles and horns in the world wont stop humans errors!