Whether group homes are good or bad, depends on the quality of the home and the situation of the individual. I have seen individuals come from abusive or neglectful family situations and thrive and blossom in group homes. The group home becomes, for them, friends and family. To others, it is confining, and with supports, these people can move out on their own and live more fulfilling lives.
I think there may be some confusion between psychiatric wards/hospitals, foster homes, assisted living facilities and group homes for different kinds of situations. There are situations in which wards or facilities are locked. And that would be terrifying, I agree. I would think that for aspies, any situation resulting in some loss of autonomy and having extra sensory inputs from different people, staff, rules (often necessary for groups of people to live together) would be stressful and unpleasant. Unless of course, where you are coming from is worse....
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The river is the melody
And sky is the refrain - Gordon Lightfoot