Yeah, kdarling, that's real cute until you consider the practical applications of such moderating.
In North Korea you are killed for watching foreign programming or studying anything not approved by the state. What good does this control do? Nothing, it's control for the sake of control and spite.
In America you are punished for such things as slander and harming someone. What good does this do? It protects the people.
Why would Ballmer not allow his kids and employees Apple products? If you think it's because he thinks they suck, think about this. Would you let your kids buy a cruddy MP3 player? I wouldn't mind it, I'd just warn them that it's not a good investment. It's clearly because he doesn't want his kids or employees minds to leave his cloak of ignorance or for his kids to look up at him some day and say "daddy...your software disappoints me...I'm ashamed to be a Ballmer".
Why would Apple not allow certain Apps on your iPhone? Because if it simulates a function the iPhone is already capable of, the default app is probably better-integrated to the OS and other default apps. Also, I feel 100% safe that every app in the app store will not harm my iPhone. Therefore it's 100% malware free. As for secure...I didn't say that <.<
Edit: Also, carrier-locking is simply done because they have an agreement with a single carrier in the USA. The agreement stipulates AT&T will eat part of the iPhone's cost if Apple will allow it exclusivity. Maybe they're in talks with other companies, or maybe other companies just said no...either way they're doing what they can.