[Yeah people tend to rat you out when you lock them up against their will. Go figure]

Sure. Except even if we don't go into the ethical issues .... what if there's a fire and you can't reach them? They'd be trapped in their rooms.

[Not unreasonable scenario considering that's how people got snatched last time]

Ozymandias is a witch isn't he? Wouldn't it be better to have him make an alarm system?