That's great and all that, but this is the real world. How are you going to force fathers to stay with their kids. And I don't think being fatherless should be used as an excuse, this has been thrown around so much, that in essence it becomes a self-fullfilling prophecy. Plenty of children without fathers, don't end up in gangs.
You don't have to force a Dad to stay with his kids. A dad will just do it.
Many military kids have fathers that are constantly away. I can tell you that most military kids aren't out there committing these crimes.
As I stated before, the best way to ensure that your children don't become involved in gangs is to have a father in the "house".
You are correct that many children without fathers grow up without committing crimes. However, it's a tougher road for them without one. Even if they don't have a father, I'm sure many had great role models. If not, then God bless them for living up to the life they were given.