you want evidence... here's a couple of links.
http://emedicine.medscape.com/article/289848-overview
http://www.medscape.com/viewarticle/528487_2
http://www.psychtreatment.com/alcohol_related_psychotic_disorders.htm
That's all i can be bothered looking up for now. If you still don't believe me then you're a lot less intelligent then i gave you credit for.
From personal experience, i have two things to add. First, my uncle became a heavy drinker after he found out he was adopted and that his real parents had died years before. After 12 months of chronic drinking he began suffereing from delusions and hallucinations. No one could talk to him. It was like communicating to a five year old child playing with imaginary friends, waiting for his lost 'puppy' to return. It got worse than that but I feel it's too personal write up here.
Second, my best mates dad is a nurse, can you take a guess at what he spends all day every day doing? He has to look after patients who are suffering from alcohol-induced psychosis. Some of the stories we've been told are really quite fucked up. The one that always sticks to my mind, was a 26yo male who believed that ice-men from pluto had abducted him several times, and the scars he had were from them.
This is all coming from someone who takes LSD and has heard the outrageous myths surrounding it's 'permanent tripping' affects. Why you wouldn't believe in it is truly beyond me.