Ryan, you're making several false assumptions that are entirely supporting your arguments:
1-People who have premarital sex have no self-control, and do not choose to ever control their sexual urges or use them selectively (not true), and that they are commitment-phobic, selfish, and undisciplined.  How about the possibility that they just disagree that marriage means something special?  How about, while you've built your concept of sexuality around one, certain tradition, they've built it around another?
2-Premarital sex is damaging and broken in the first place--you've provided no convincing evidence for that, only your own insistence.  In fact, premarital abstinence was NOT a part of early Church teachings, and only came into regular application once issues of primogeniture and verifying paternity for property inheritance became an issue.  Check it out.
3-People who have premarital sex assume the likelihood of divorce--while this may be true of some people, I've found that more assume the likelihood of divorce in a rushed courtship.
4-The entire point of marriage is happy, heaven-worthy children--I suppose that's entirely a matter of opinion, and I heartily disagree.
5-That the other commenters on this post all believe that early marriage will definitely lead to dysfunctional relationships or divorces--I don't think anyone's saying that.  Most seem to just think the pressure to apply the early marriage solution to all relationships is too cookie-cutter to work for everyone.  
6-People who have premarital sex do not want children--I think the numbers would prove you wrong there.  Many, many unmarried couples (who either don't want marriage at this point or know they never will) want children and already have children who were wanted and anticipated.  Those numbers are growing.  
7-Children of unmarried parents are screwed up and feel that their parents are undisciplined and unloving.  The only children who feel that way are the ones who are genuinely products of bad relationships (often married ones).  Or children who've spoken to you about how much you disapprove of their parents.  

I've seen healthy relationships between people who did not have premarital sex.  And I'm willing to acknowledge that there's a place for that.  But I've seen more relationships (the vast majority of contemporary relationships) that included premarital sex, relationships which have been healthy and thriving for years.  So Ryan, I'll give you two choices, just like the ones you gave us: 1--continue to close your eyes to the reality around you, and insist that any relationships that include sex outside of marriage are doomed, bad, and sick (in other words, look for the negatives in a situation that doesn't meet with your approval; or 2--Be open to the possibility that each conflicting opinion on this post represents a separate path to happiness and respect, that people who live differently from you have just as much a shot as you do.  

Thanks for the rousing debate!