Why is mental health the biggest problem facing our world today?

Because they can't do as much stuff and they need help because without the help they can't function as well. 

A lot of people have disabilities and can not function as well as most people, and they can not do most things on their own. Or either, they are a danger to other people, themselves, and society. The people who are psychotic are starting to overcrowd jails leaving less space for people who actually need to be in jail, i'm not saying that the crazy people don't need to be in jail they just need to be in a psychiatric hospital instead of a jail. 

My motto has always been ''live life to the fullest.''