The glass is an integral part of the safety systems, on many vehicles
the glass is used as a barrier for the airbag. It acts as a backing
plate so the bag doesn't just act like a balloon when it deploys and
just bounce around. If the glass isn't bonded properly it will break
free and the bag becomes useless.
Probably not the glue but what it was attached to. Most glass is bonded
into the painted window channel, and rust/corrosion or failure under the
paint and the paint just peels up. In my area it is the rust that causes
most issues, even "sealed" connectors corrode internally from it.
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