Why allow domestic quarantine?

It was reported that the four cases of swine flu in Malta have opted for voluntary quarantine.

I am somewhat amazed that this request was granted, as would it not be safer to keep these cases under observation in a quarantine ward in Mater Dei Hospital?

This would be so both for the benefit of these patients and for the community in general, as I believe a specialised ward could better handle these cases than a normal household that unlike a quarantine section in the hospital would not be able to provide a sterile environment and avoid further spread.