Do you mean in people getting married and thinking if it doesn't work they will just throw it away?
Pretty much there's no way I can answer this question without sounding completely inexperienced and not "qualified" to contribute. :) I've never been married, but I've grown up around a lot of people who had successful marriages because they married under the impression that divorce was only an option under extraordinary circumstances such as adultery, abuse, etc. This caused them to be very careful in selecting their partner and to wait until they were mature enough and felt ready to make a lifetime commitment.
When you go into it knowing that you've got to make it work no matter what, you're a lot more motivated to make a careful choice all around. I'm not saying that means that most Americans are nonchalant towards marriage, I just don't think they take it as seriously as they could.
All the couples I know have had serious problems within their marriage, but I know very few who have divorced, and I think that's because they strongly believed marriage was for life.
That's not to say that you didn't take it seriously or didn't exercise careful consideration, etc. in your experiences, moonmustang. Everyone makes mistakes, and has to make the best decision for themselves according to their situation...I was just giving a different perspective :) old fashioned as it might seem...