Homeless men don't care what people think about the way they look. Societies ideas of fashion are meaningless to them. They have no employer or wife/girlfriend to tell them how they should look, so they just do the most natural thing, and let everything grow untouched. This produces the most awesome beards you are likely to see. It is rare to find a man who is gainfully employed and/or married with the same outlook......

"He that hath a beard is more than a youth, and he that hath no beard is less than a man." - WILLIAM SHAKESPEARE