You send it to the defense because it saves the court copying costs and time. It also makes them aware of the opposition to their proposal prior to the court hearing.
There is nothing sinister about it.
You file a copy with the court and a copy with the defense.
In a court hearing everybody gets to see everybody elses cards prior to the hearing. It's a principle of the system.
This copying of the leters is part of that principle being followed.
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