First - you are right.

Second - questioning dogma is always virtuous, even if the dogma is "people of race A are not worse or better than people of race B", the fact of questioning itself doesn't cause anything bad, while banning that from being questioned also bans the similar or associated statements, and similarity\associations are subjective.

Third - the reason our world is in such shit is that it became commonly shunned to question authority and normalized to fear authority. Because common set of moral principles is authority too. Where in 1960s (segregation and much more liberal gun laws in places like USA, no voting rights for women in places like Switzerland, former Nazis everywhere feeling nice and joking about it in public in places like Germany, literal colonial wars, normalized racism and so on) it was normal, at least in books and movies, to question any person, in suit or not, demanding anything from you, and asking for some legal substantiation. Even in the bloody USSR. In our days in TV and books and imagined universes and in reality asking "why should I do that" is treated as a mutiny.

We live in a world where it's forbidden to ask "by which right".

At least in societies pretending to be civilized this was considered a thing of the past after WWII. Not that it didn't exist. Now it's normal, people look at you with hostility for saying the obvious about preemptive obedience and such.

That is the dumbest question ever asked

Really. This is the dumbest question ever.