"Thirty-eight percent of homeless individuals have a mental health concern. Nearly one-half of homeless men (47%) and 16% of homeless women also experience alcohol use disorders.
Furthermore, the combined chances of alcohol, drug, and mental health problems anytime in a homeless person's life are estimated at 30%."
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http://pubs.niaaa.nih.gov/publications/Social/Module10DHomeless/Module10D.html>
Some further stats.
"Approximately 40% of homeless men are veterans, although veterans comprise only 34% of the general adult male population."
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http://www.nationalhomeless.org/factsheets/veterans.html>
And let's not forget that 1.5 million kids are homeless, making up approximately 42% of the homeless population.
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http://articles.cnn.com/2009-03-10/us/homeless.children_1_homeless-children-family-homelessness-child-homelessness?_s=PM:US>
Now that we've got some basic numbers out of the way, let's get into the meat of your posting, namely your disgust with the homeless who are using drugs or alcohol.
First of all, please recognize that the mentally ill, who are prevalent among the homeless population, have been sadly underserved in this country. They can't get adequate help, and their illness can, and does, drive them into homelessness. Many of these people take to self medicating, meaning alcohol or drugs. Our society has let these people down.
We are having more and more children wind up on the streets, through no fault of their own. Once there, they are generally exposed to alcohol and drugs. No kid should be homeless, period. We have let these kids down.
Veterans have been a staple of the homeless population for generations now. These proud people who have served their country come home, and attempt to slide back into civilian life. But some simply can't, usually because of undiagnosed PTSD or other such like problems. Again, they start self medicating with alcohol and drugs. Our society has let down those who have served our country.
Your display of righteous, Calvinistic disgust at the homeless is also part of the problem with our society. You look at a homeless person, and you don't see a person. You see an addict, a bum, somebody who wants something that you have, a bit of cash. What you don't see is a person, a human being, somebody who has been let down by our society. You think that since somebody is an alcoholic now, that it is the alcoholism which drove them into homelessness. What you fail to recognize is that it is, in most cases, either the previous mental illness, or the condition of being homeless, which drives the person towards alcohol.
In this country we do a huge disservice to our poor, and mentally ill. If you are poor, living from paycheck to paycheck, you are, at all times, one unexpected calamity away from being homeless. Lose your job, lose your house, you are out on the streets. Once you are out on the streets, it becomes infinitely more difficult to make it back off the streets. If you are homeless, the stress and tension in your life skyrocket, worrying about finding food everyday, a place to sleep, how to stay safe, blaming yourself, despising yourself for having to do the unspeakable simply to survive. Is it any wonder that people turn to alcohol or drugs to find relief? You're certainly not going to find relief from your fellow citizens in this country, since the vast majority are like you, Calvinistic puritans who despise the homeless instead of help them.
If you are mentally ill, you're even worse off. Ever since Reagan loosened the standards in the eighties, the mentally ill have been getting kicked out of hospitals and treatment shelters straight on to the street. With no social safety net, no capacity to hold down a job, the mentally ill slide into homelessness. Not only that, since they either can't get, or can't afford to get the medication that they need, they start to self medicate with drugs and alcohol.
For far too long we have treated the homeless as a failing of the individual. It is part of that Calvinistic ethic this country was founded upon. But homelessness is a failing of our society. In the richest country in the world, there should be nobody without a home, nobody whose mental illness goes untreated, no veteran who isn't looked after when they come home, no child who has to sleep on a grate or in a door. But in this "pull yourself up by the bootstrap" society of ours, we are more than willing to put the blame, the onus, the shame of homelessness on the victims of it. And once a person is homeless, we make it exceedingly difficult for them to escape their plight. Our society creates a permanent underclass, but blames that underclass for causing their own plight. This is exemplified by attitudes like yours, and others, who refuse to help those who are down and out, no matter why they got there.
My suggestion for you, sit down and talk to the homeless, get to know them, find out their story, discover their humanity. But be warned, that is a dangerous path to take, for once you discover their common humanity, it will be infinitely harder for you to dismiss them as alcoholic bums. You will find that they are your brothers and sisters. Oh the horror, discovering your own humanity.