Because instead of curing their Alzheimer it might cause them to die faster with big side-effects if it's not tested well first. Eventually they will be allow

Because instead of curing their Alzheimer it might cause them to die faster with big side-effects if it's not tested well first. Eventually they will be allowed and there will be a human trial. Not when they're still experimenting. Just because someone has Alzheimer doesn't mean they're automatically a lab test subject.