public figures should avoid expressing opinions in public about things that they have not personally experienced or been directly affected by
On the one hand, normally public figures have many followers who treat the public figures as model, if public figures express themselves in a nonresponsible and superficial way, their followers may act accordingly.
Moreover, public figures are just human being like each of us, they are, in most cases, good at one field. It is unrealistic to expect them to give correct answers to all public questions. It is highly possible they will give non-sense answer to a question they never experienced or heard of.
Admittedly, it is hard to prevent all public figures from doing so since the wide spreading internet, TV programs. The possible way lies in educate public to listen to public figures with caution.
B4. Each generation's culture achievements--such as those in music, art ,or literature--represent improvements on the cultural achievements of previous generations.