We’re talking with exception to people who don’t threaten themselves or others. Themselves being the gray area.
Of course you would only focus on people having a psychotic breakdown where they threaten others, but having a mental health crisis does not mean someone is automatically a threat to those around them.
Here’s a guide to de-escalating various mental health crisis situations.
Just because it happened doesn’t mean it wasn’t a mistake that we can learn from. In that regard, it was not justified.
Now if you are talking about taking the same action in a parallel universe, then that definitely depends on the perspective you’re modelling.