Yeah, I'm going to destroy one of my doors just to please someone on an Internet forum. This is getting ridiculous; it's starting to look like you're trolling us here. But I'll play along...
SWAT teams often use door-breaching rams because it's faster and easier. But troops on patrol don't always want to lug something aroud like that, so kicking in the door is an alternative way to do it.
And what makes you think people in the Middle East aren't capable of reinforcing their doors? I was in before Iraq and Afghanistan, but I went to many different countries when I was on deployments in the Marine Corps infantry. And you'd be surprised what kind of doors they had in some of the poorest countries. Take Albania, for example: The poorest people had houses made of concrete blocks and tarps with electricity stolen off the nearest power line, but many of those houses still had well-made hardwood doors and stained-glass windows. Supposedly there was a large black market in cheap stolen goods from nearby countries, and beautiful well-made doors and windows were easy to get.
No, you can't always kick the door in with just one kick, but many of the doors we have in the US are pretty flimsy or have flimsy door jams. Moomooboo, you're simply wrong here, and your arguments are getting ridiculous.