It is not a bad idea by a long shot, but the ethical dilemma comes up when you consider the children that will be unwillingly involved.
Denying the adults treatment is one thing, but denying the children treatment because of the decisions their parents made is no more acceptable than allowing that parent to deny lifesaving treatment for a child.
> And allowing parents to deny their children vaccine that may save their health and life and health and life of other children is all fine?
Well I would say no. I am in favor of giving all children vaccines, with or without the approval of the parents.
As I said, the ethical problems are around the children. If adults want to opt themselves out, then I am perfectly cool with quarantining them in colonies and refusing them medical treatment. However they should not be permitted to drag their children along in such madness.
Denying the adults treatment is one thing, but denying the children treatment because of the decisions their parents made is no more acceptable than allowing that parent to deny lifesaving treatment for a child.