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Clean the loose crap out of the void. Put new joint compound in the void spreading a very thin layer onto the paper (this will act as glue). Place a piece of joint tape over the area (paper or mesh). Run your taping knife over the tape to smooth. Let the area dry and then put your trim back on.
The myth is and isn't a myth. The paper holds the gypsum in place. Breaching the paper simply weakness the area. When fastening the rock to a stud if the screw or nail breaches the paper it looses holding power. It does not render it useless it only means you need to add another screw a few inches away in sound material. Getting the paper wet is a bigger issue as the paper looses all strength and the fasteners will pull trough the paper the gypsum becomes brittle and will fall apart under it's own weight.
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