I think it's ok not to let cats go outside, stops them killing birds and getting into fights. Mine are fully indoor cats - maybe if I lived in a different country I'd consider letting them out (under supervision).
Mine is allowed in the (fenced) garden when we're home. Still kills lizards, grasshoppers and even snakes from time to time. Then again, Maine Coon's are good hunters.
I think it's ok not to let cats go outside, stops them killing birds and getting into fights. Mine are fully indoor cats - maybe if I lived in a different country I'd consider letting them out (under supervision).