The threat of home invasions, of which there actually are some, is one of the ways the gun lobby use to scare people into wanting to keep their guns.

In some parts of London, they just have locked grills across doors and windows.

They don't realise that if a criminal thinks you have a gun and are likely to use it, they will shoot first and why anyone regards the ability to walk around in public openly carrying a weapon is a really important freedom, is beyond me.

Interesting info here.

http://www.motherjones.com/politics/2013/01/pro-gun-myths-fact-check