I looked up something quickly, to see if it was still true.
In the UK, where you're not allowed to use firearms to defend yourself, home invasions where someone is home is 64%. In the US, where it is permissible, home invasions where someone is home is 27.6%.
You're over twice as likely to be robbed while you're home in the UK as you are in the US. I'm sure the factors are complex, but knowing that you're actually risking your life when you break into a home in the US has to be one of the factors.