First off, that is just it, while I understand there are people with those issues. Do you not think something won't be done about it? Also, I'm sure they may start sending our things and its not like we can't transfigure certain items that are needed...
As for Carrow, wouldn't having them here keep us safe in case he attempts to return. Leaving the rest to apprehended him if he does not? Though they did let him escape...