In the case of morgue's they are already solving this by having air conditioned semi trailers parked by the hospital where store bodies until they can be moved.

I see a morgue at capacity and I think about the thousands of family members who aren't able to properly grieve for, manage, and bury their deceaseds.

I wouldn't jump to accusations of callousness on the part of the GP quite so fast.

Improper corpse disposal can itself help spread disease.

Yes. Because heaps of those lifeless atoms decomposing in the streets become vectors of many awful diseases. That was the case with most pandemics we've had to deal with so far.