Every point in your argument except the first points out that "it has been suggested" but no-one has every been able to prove any of it with any - even purely statistical - evidence.
Who's suggesting these things? Your article doesn't say. I'll make a suggestion myself - these OPINIONS are "suggested" by the people who sponsored the study and want marijuana to remain illegal. With as much money as the government and pharma companies have put into proving marijuana is hazardous, if those dangers actually existed they would have been proven.
There have been many studies showing marijuana can be used in effective treatment regimes to help treat Bi-Polar disorder, schizophrenia, some forms of autism, ADHD, and quite a few other mental disorders. There has never been ANY evidence that marijuana use alone causes any of the disorders you listed.
Here's a clue - when a study says "it has been suggested" it means "this is what our sponsors wanted us to prove, but our findings didn't substantiate that whatsoever."
Also, some of the commonly prescribed medications for those disorders have adverse interactions with marijuana, and using them together is worse than using nothing at all. Many of the studies that claim marijuana is detrimental are conducted with patients using those medications also, in conjunction with marijuana, but only marijuana is listed as a cause for the adverse reaction.
My primary source for this is my housemate, a degreed pharmacologist. A simple google search will turn up a plethora of sources that verify the rest of the information I've provided.