This is what happens when you try to hijack a manga show for your own political stance. Oda isnt a leftist or a right wing chud. Odas main criticism throughout this entire story is authoritarianism and in favor of freedom and self determination. The manga criticizes everything
>a isolationist nativist society like Wano
>a racist slave owning global spanning empire like the world government
>a multiracial country like Whole Cake Island
>a country of people seeking revenge for past wrongs by trying to subjugate others in the modern day, both times with Arlong amd Hody
Etc etc. Its not a criticism of systems, its mostly of authoritarianism which comes in all systems as a way to achieve ones goals that the author actively preaches. As long as people have freedom to choose they can choose an old monarch (King Riku) or anyone they desire. Basically Oda thinks democracy is actually good