&gt; this is just anecdotal evidence Yeah. That's obvious. In the US exterior doors, or doors into common areas like with apartments, are heavy and strong. They have to be to meet building codes. This includes needing to withstand certain impact forces. Interior doors are light and weaker. Not weak, just weaker due to them being lightened for easy of frequent use. Why do you think that American doors are weak? Because they get broken down in movies? They break like that in movies because **they use prop doors which are designed to do that.** It's all for show. Because it's a entertainment. Real doors are nothing like that. Seriously, the amount of things that Europeans here on Reddit see in Hollywood movies and assume that real life here is exactly the same is absurd. Hell, here you can even get extra heavy all metal security doors from any hardware store if that's what you want. Doors here are plenty strong.