Voting can be helpful, but not always. For a long time the voting majority in some places thought treating black people as lesser human beings was fair. In those cases, having the option to easily choose a different government would be useful.

In a way, having states in the US is that idea. E.g. moving from a deeply racist southern state during the height of equal but separate era to a more progressive state would have given you far better results than voting in terms of how you were treated by the local government.

Depends on the type of voting employed.

First Past the Post (what most nations us) is not a way to pick a true representative official, it breads defensive voting, vote spoiling, and all kinds of other problems where you end up in a spiral of worse and worse people, and where everyone says "I do not want either option but...."