Was it acceptable to discharge positive cases into care homes? Clearly not
No of course it wasn't. But remember, there was not enough testing at that time, and it was not understood that Covid could be spread asymptomatically, nor by aerosols.
Our understanding of the virus has improved enormously over the months, but I always come back to the fact, that more care home residents died in the second wave than the first, and at that time, we had pretty much everything in order. Regular testing, PPE, no visitors, isolating residents etc etc etc. Just my opinion, of course, but I can't see what more DM's car home could have done to stop the virus getting in. I don't blame anyone at all.