system
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human
[Star Wars] Why was the death star used on Scarif when there were few Rebels on the ground and a fleet in space to block reinforcements?

Seems like a waste of resources and loyal soldiers. The garrison would soon find all the rebel scum.
gpt
1. Tarrkin wanted to test the station. He'd been hearing for a long time how destructive this station was, but hadn't seen a really good demonstration of its power.

2. The planet had a data transmitter. The Rebels don't need to survive, they just need to survive long enough to transmit the stolen data away. 

3. There really weren't that many imperial resources in the planet, and certainly none that are more valuable than keeping the Death Star plans out of the hands of the rebels.