Happy Girl:
Most of the working guys when they get older, tend not to want to sit around after work. We tend to go out and relax after a long day of work. If this means that we watch a movie or TV or go someplace with friends then so be it. This does not make us less frum.
It seems to me what you are describing “they become less frum, drink alcohol, do drugs, become lax in halacha with girls, become lax in kosher” are high school kids that are rebelling.
Furthermore, most men who are older and are working usually DO move out of their parents house, not because of rebelling or as such but because they want to live on their own and have their own life. Most working boys are mature, logical, and have long term goals set, not like “just married” couples at the age of 21 or younger, or boys still learning in kollel, who are still relying on their parents.