I think that it's safe to say that aside from simply walking through the front door, breaking a window is probably the most common way to break into a house. But, what if the glass broke but didn't break through. How many times would a burglar loudly beat on a window before getting frustrated and moving on?
Burglar-proof windows use a heavy polyurethane laminate sandwiched between two pieces of glass to form a window that is not only extremely efficient, it's also extremely difficult to break through. Now, if a burglar is smart enough to stop whacking on it and pry the window open, it could still be possible to break the lock. But the questions are: How much noise is this burglar going to be comfortable with making? How long is the burglar going to be willing to "problem solve" this frustrating window? What are the chances that you'll be inside and not hear the racket that the burglar is making?
Of course, a homeowner can always install "burglar bars" on their windows. But, what happens in case of a fire? Being locked behind bars, imprisoned in your own house is probably not a great idea. Besides, burglar bars don't exactly add to the look of a home.
