Goodness, a lot of odd views on this thread. Some of the comments about mental health issues are disturbing. Very very few people with mental health issues are a risk to others, and if they are the risk does not suddenly apply when they get in a metal tube. Those with a fear of flying are perhaps the exception, but many do not consider that a mental health issue!
We have enough issues with doctors who have no knowledge of aviation medicine trying to certify whether patients are fit to fly with physical issues.......
The fact that this is newsworthy around the world suggests the number of people who cause problems due to mental health issues are very very few, and do not justify another layer of idiotic and incompetent regulations
The big issue is those that see an airport as an excuse to get as drunk as a skunk and then become abusive in flight.