In a democratic government you have the right to protest. Less-so here. At the end of the day the mods have the final say. They could, at any point, dictate extra rules to us and enforce them with bans. We would have no choice but to obey or leave. That's their choice because they own the community here.
It's harder to leave a country than it is to leave a Lemmy community. That's why protests won't work here. If you disagree with the result of the poll, and by extension the way this community is run, you can always leave with a single click.
Side note: Morality is inherently subjective. Many middle-eastern countries consider women showing off their bodies to be immoral, but in the west it is accepted. Both cultures generally consider their way to be correct.