From the national institute of public health;
''It is difficult to say when there will be an effective vaccine against the novel coronavirus. It takes a long time to develop a vaccine for a new infectious disease, usually as long as 5 to 10 years. Every effort is being made to accelerate development of a vaccine for COVID-19.''
This bit in bold, is enough to make people worry and question the process, and no one can blame a single person for being wary and cautious over their own health because of it. My parents have had covid, they had a rough time but thankfully survived. They've been told a whole host of information, they have antibodies so are unlikey to have it twice, indeed I think four people ( may be wrong ) have had it twice world wide. Would I like them to have it, a part of me yes, but I respect their right to be cautious. PS they are not simpletons, both were doctors ;-)