If you were the parent of one of those immunocompromised children bringing your kid in for a routine visit, and another child in the waiting room had one of those potentially deadly diseases that can be prevented by vaccine, you would panic.
Actually not. And I’ll tell you why not. Immunocompromised kids have idiots for parents if they have not taken universal precautions when entering a room full of germs which is actually any ER, OR or Doctor’s office. As parents of young kids, we were not idiots. Aside from that panic causes poor decision making and gets people hurt or dead.