Brake Light problems of the 2012 Cadillac SRX

The first concern was due to a leak in the sunroof shorting out a circuit board the tailgate of my vehicle nearly shut on my son as he was attempting to reach in to remove an item from the cargo space. He didn't know it was closing and there must not be a working safety feature because if I had not screamed it would have closed on him. Secondly, the headlights and brake lights have started flickering while the car is in motion. The headlights are already overly dim due to a moisture problem, but now they flicker and while driving at night this is not safe. The dash board lights also go out making it impossible to see the speed you are driving. You can hear water sloshing inside the car and you can hear the electricity crackling also. I bought this vehicle for my son but he cannot drive it due to so many safety issues. I called gm and they basically blew me off like so many other customers with the exact same issues. I spoke with 2 reps over the phone and tried the live chat feature. All 3 reps said to take it to a local Cadillac dealer and pay hundreds for a diagnostic to be run and according to all of the other upset customers I am looking at having thousand in repairs. Gm knows about the issue and corrected it in newer models. They have a responsibility to their customers safety.