"in which case guns are no use at all"

What? The statistics that you gave show that incidence of burglaries is half in the US (guns) than that of UK (no guns). I'm given to understand that most burglars try to strike when no one is home, it won't elimiate *all* burglaries, so it's a bit of a straw man argument anyway. Also, if I take into consideration the costs involved, you're looking at thousands of dollars per window for unbreakable glass, plus steel reinforced door frames, etc., as opposed to a few hundred for a home defense weapon. Lastly, back to my original point, a burglar is likely going to avoid a house in which he thinks there is a home owner ready and willing to defend him or herself.