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Never-- but never assume that someone who is a lovely person and has treated your child with dignity and care for years is incapable of being callous to the point of cruelty when push comes to shove. Never assume that having your child within earshot will curb anyone's tongue.
Agreed. Unfortunately speaking ill of a child within earshot may be a technique to hasten a family's departure.

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... simply "too much trouble"... that s/he was uncertain that we were "accurate" about risks, that even if we were, "other children" needed to be considered, that we could expect "no changes," and that we had to "decide whether or not this was something we wanted to do under those conditions."
Agreed. Unfortunately, for a PG child without 2e dx, there is often no requirement for a public school to accommodate the child. Policies and laws, if they exist, often have no teeth.

While other children need to be considered, balance can be found between serving the needs of each.