Okay... Let me share some of my experiences on this subject and my opinion...
Right now, I am in a school with mostly drop-outs trying to get their education again after dropping out. This school is the last chance for most of these people.
I know a lot of people from this school. I know their backgrounds, a bit about their social lives etc. Now let me show you the contrast between the people that do have both parents/have a decently happy family and the people that have only one parent/a family with non-stop fighting going on.
The group with both parents, are all there because of either laziness, being stoned too much, not being smart enough or because they had to stop school without a choice. These guys all have a fairly decent future. They are able to keep on studying after they finish this school and just at least do something productive with their life. The average degree of happiness is pretty high with this group.
The group with one parent/a family with fights (about 60% of the school) are all people with bad social skills (jerks, anti-social, etc). They have all commited a crime at one time or another. They are all depressed most of the time. Most of them have a future ahead of them working in a supermarket. Last year my class had 53 people in it. Half way through the year, 10 people had dropped out. Each of these people had divorced parents, a parent that passed away or unrest in their family. By the end of the year 17 people had dropped out. Only one of them was from a normal family - he only happened to have an IQ below 100 so he didn't have much of a choice.
If you start an unhappy marriage and have children, I honestly believe you deserve to die a horrible death. You are putting children into the world that will suffer because of your stupidity.
I want to have children. As a matter of fact, I think that if I ever find the right woman (and I know I will) to take care of my children and raise them in a responsible environment, I will marry her. I will stay by her side, even if she becomes big fat and ugly from giving birth. I want to create great offspring, that excels above all other social groups in this society. I learn things to teach my future kids.
I am not marrying a woman, until I know for certain I can live my life with her properly and know that she can raise my kids. I don't care if it backfires, I'm a firm believer of always being able to work out your differences.