If the drugs have the desired affect, that of reversing or arresting dementia, then I'd think most folks would gladly accept the increased risk. Most dementia sufferers know what is happening to them, at least in the early stages. It's pretty darn miserable.
OTOH, they only work for some people, and even then sometimes only for a relatively short period.
My Dad had dementia, and died of pneumonia. The drugs they gave him helped at first. I don't know if any of the one's mentioned were what he was taking. I don't live nearby and my Mom and brother never seemed to be able to recall what the drugs he was taking were. Thankfully he only "lived" in the nursing home for three weeks, a miserable three weeks, but only three, before the pneumonia released him from his suffering.
These atypical antipsychotics are prescribed for demented patients who are usually very agitated.