Nothing is really “non-breakable” the question is just how and when it fails. The calculation with glass in cars is that the most important issue is rider/driver safety, and that means a failure mode that doesn’t produce large sharp shards of glass, polycarbonate or whatever material you want to use. It’s also helpful if you as someone inside of the car have a prayer of escaping in the event of an emergency that makes the doors impossible to open.
Thieves are a pain, but not so much as being decapitated by a flying blade of window glass.
Basically it’s more important that the fire department or the people inside the car can break the windows without heavy equipment than to make ot thief proof. Making it thief proof would make the car a potential death trap. Also, a “professional” thief would just bring a portable angle grinder with a diamond blade to compensate anyway.
For safety. Say you drove your car into a lake. You can’t open the doors because the water pressure won’t let you until you can fill the car with water.
You need to be able to break the window to escape.
They’re designed to break and break as safe as possible which is why you end up with very small pieces of glass and not glass shards when you break a car window
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