Why is getting drunk a serious (read mortal) sin?

Jesus' first public miracle was turning water into wine at the bequest of his mother. We know that for

thousands of years people have drank of the vine, and in colder climants beer did the trick. There is something warming in a shot of whisky, or brandy, or grappa (italian bootleg). Alcohol - in and of itself - is not at question here. The question is to what extent is it morally permissible to imbibe? 

It depends on the person. I know some who blush just looking at a glass of wine, and others who don't seem phased by a whole bottle (ok, half a bottle). The golden standard doesn't exist. How often have I heard, from an unrepentant young person a few days after a party, "I only had three."  Well, my friend, next time have one or two. 

Drinking relaxes you. But, then you become super serious, or extra chatty. Your head "buzzes" with that familiar sensation you like so much. Your reactions a bit slow (shoot). You are crossing the line. You know it. You need to stop, and yet you take a look - a whole ice chest full of cold beers. Rum and Coke. Whatever. But, see,  you've already damaged your ability to choose prudently (otherwise, you wouldn't have spilled that last beer). You've already had too much, but you "reason" and take another one. 

It is a mortal sin if done intentionally. If you're not drinking to get drunk, but it happens anyway, it is likely a lesser sin. If this is habitual, well then, you're back up to grievous. It is no small matter. 

Why? It doesn't hurt anyone (usually). It feels good (until the next morning). Etc. The answer is simple: you are intentionally flooding the most precious gift you have to offer God with intoxicating chemicals. Your REASON (the ability to judge) and your WILL (your ability to choose) are impaired by excessive alcohol, and your innate image of God is washed in booz. 

That's why you may not be culpable for the stupid things you do while drunk, but you are culpable for being drunk in the first place, risking stupid sins, undermining your most precious assets, and putting pleasure and the flesh above obedience and love. Its a stark reality. The mortal sin lies in being drunk - even if you go to sleep immediately in your own home. 

Rather than upset you, let this remind you of the immense value of your reason and will. Let this mirror the beauty and sanctity of your whole person working together, the higher powers commanding the lower powers, for the glory of God. It just isn't possible when you're drinking too much. Period. 

So, enjoy that glass of wine. Savor that bottle of beer. Delight in that shot of tequila. Then use your God given reason and will and stop. 

If you can't stop, my friend, it is the time to not even start and to get help if needed.