These children are not "misbehaving." You make it sound like they're just little brats who need discipline. The behavior issues are manifestations of their disabilities. Seclusion rooms do not "control" these behaviors. If they did, no child would ever have to be put in one more than once. They are most definitely used for convenience, when a teacher does not feel like following the behavior plan that would have prevented a full-blown escalation. Often the parents don't have to deal with these issues at home because, unlike the teachers, they follow a behavior plan. Very often the schools will not allow for an functional behavior assessment because they're too lazy to abide by it. It's easier to just drag a child into a seclusion room and lock the door.
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