I would do the same but it's not that simple. The plastic shelf sits between the outer and inner bodywork, there is a void beneath until both parts are spot welded and if you can get your fingers far enough down into this void you find the water is filling this area as well and has nowhere to go and it looks like the rear outer panel needs to be removed to gain access for a remedy. Any time you change a bulb, the whole light unit has to come off the vehicle, meaning the seal is also being removed each time. Unless you regularly remove the interior panels to check, the first you know of the problem is the soaking wet carpet