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Do you consider people with an acute neurosis the same way? Would you shun your sister if she had a sudden mental breakdown and believed to hear voices?This doesn't seem like an honest analogy. The legal/social concern here isn't about the individual, it's about their effect on others, and the extent to which it is willful negligence of something treatable. If someone has a known, treatable mental disorder and, repeatedly, refuses to follow the treatment and then engages in wilful behavior endangering others then yes that can absolutely be an issue. A better example would be epilepsy: in much of the world people with it cannot drive (or are restricted in license type/conditions, no Class C for example), because the accident rate for drivers with epilepsy is over double the baseline. They're not bad people obviously. And my understanding is that just in the last few years some very promising new medications have had studies showing significant improvements without side effects. So perhaps under those treatments it'd be fine for them to drive.
But if someone with epilepsy knew they did, refused treatment, lied about it, got a commercial license and then started side swiping people with a semi, then yes they'd be "shunned" (dealt with). It's the "dangerous" qualifier in OP's post that is the big issue.