Ok, I didn't read every single post, as I am limited on time right now, but I will put my view on things from what I DID read.
First off: I noticed at least one person talked negatively about forcing children to do things. WTF?!?!? This is exactly the kind of attitude that got us in the shit we are into today. Parents are supposed to raise their children, which means instilling (usually by force) things into their children. 100 years ago, it was commonly accepted that physically disciplining children was alright, even 50 years ago. In the past 50 years, more specifically the last 30, parents have done less and less for their children. They don't force children to realize that there are differences between movies/video games and real life, they don't force their kids to go outside and play, they don't force their children to show respect. What has happened due to the lack of force by the parents? School shootings, massive obesity, kids/teenagers who are downright pricks. Is this what you want to see? If you think forcing your kids to do things is wrong, well I have one suggestion for you: DON'T HAVE ANY!
Second: Most areas in the United States have rules/laws stating that children can't attend school (or preschool) until they are potty trained. Obviously there are a few exceptions, like if the kid is retarded or is physically disabled. But for the fact of just not being potty trained? Hell no. And I totally agree with this.
Third: Yes, with the world as it is today, where both parents usually have to work their asses off, they don't see a lot of their kids as a result. With that in mind, they should instill values and potty training into the time they have. There are ways to positively (and fun) ways to do this.
Fourth: I read somewhere in this topic that some have had traumatic experiences in the bathroom. Care to elaborate? This can mean a wide array of things, although for some I can get a general idea. And yes, some probably have had traumatic experiences which can hinder them in potty training and other things, but those are usually secluded cases. I guarantee they have nothing to do with this topic, where kids are going to school in diapers. That rests pretty much fully on the parents laziness.
Closing Statement: If you can't or won't raise your kids how they should be raised, then don't have kids. This planet is overpopulated the way it is. Don't bring kids into this world if you won't raise them to be a higher citizen than most are today
-Sky