In some contexts, some opinions are more or less equal.
But there are contexts in which this cannot be said,
and there are opinions which seem obviously strange or queer or -- wrong.
The main task of science is to clearing opinions. The method is, NOT to leave opinions (hyptheses) as they are but to falsify them.
As a matter of fact one gains new ones and never the truth itself. So, the limitting to opinions, viewpoints, perspectives is a mission in regard to myself, not to others, without losing respect. And the limits are not "total" as I am allowed to surely know: 2+2=4.

Most important gets the discussion on behalf of the so called 'universal human rights', i.e. such rights humans should have in every culture, in each situation, never weakened by opinions, viewpoints, perspectives.