That would probably be better, but according to some reports here on the DisBoards, including within this thread, there have already been instances where a male employee went to check a solo female's room.
I also always use it, but recently I've been told that some hotel employees have a quick and easy way to open the security latch from outside.
That would also make the assumption that a woman couldn't be a terrorist though, wouldn't it?
Which brings us back to square one that these "security" checks accomplish nothing other than making people angry.