Alcahol ,why is haram or forbind in islam?

Any one with some knowledge of figh can elaborate this question here.
some of the reasons for the classification of alcohol has haram are has follows.

God wants us to be in a stable mind all the time .for alcohol affects our mental state when drank up-to a certain quantity .an intoxicate person is capable of doing many things without full knowledge or good judgement .
The supreme of law of Allah ,the sharia forbid the drinking of Alcohol at every cost .no little or large quantity is permissible.some may argue that i only drink it to relax but ,it is haram ,find acceptable soft drinks that are not harmful for you to drink.

the key principle that determines the halal or haram of any thing in Islam have to do with BENEFITS AND THE BAD EFFECTS .
if the bad effects outweigh the benefit then such action became a thing of legal debate.
but alcohol is declared in an unequivocal terms in the quran as HARAM and we should stay away from it .
a drunken person cannot recollect his/her actions .a survey in u.s states that the majority of cases of incest are by parents of alcoholic background. rape,murder are normally committed by men dependent on alcohol in some sort .

the society is what Islam looks at ,not the individual alone.
some also argue ,that they ''drink in their privacy'. that is also haram even though it is much less worst than drinking in the open.
the bad medical effects of drinking is high and for that Muslims are advice to stay away from alcohol.if you are dependent ,try to quit drinking it .it is classified as the MOTHER OF ALL SINS .this statement may be ironic because fornication is worst than drinking .they are both major sin .but the after matter of fornication could produce an unwanted children .a drunk person can do many vices as well.
may God make it easy for us to obey his commandments