Let's use the USA as an example.
Nobody alive today agreed to the form of government used today, they were simply born into it. Also, the form of government today is entirely different from the form of government used hundreds of years of ago.
Not many people alive 240 odd years ago really gave their INDIVIDUAL consent to the form of government either, elite land owners told them they were the new bosses. Most people of any race or gender were not involved and certainly no women or non white men had any say. This is a topic most people fail to consider, I could expand a great deal on it, but for brevity won't here.
When a group of people vote, and within that vote it is assumed that the people who didn't vote at all or weren't allowed to vote, or voted in a direction different than the prevailing vote indicates are somehow held to the vote...
...the results of the vote is involuntary to THOSE people. Yet many of THOSE people never agreed to the process in the first place. Often the number of people that didn't vote combined with the number of people that voted for something else or would have if it was an option is greater than the number of people that voted for the "winner".
A majority vote, assumes a majority will, and often that is not the case. First, if it assumed that the final "choice" between shit sandwich and turd salad is an actual choice, when it is a kind of false dichotomy, it doesn't represent ALL the choices. Many people make a choice based on voting for somebody not because they like them, because they hate the other douche more.
I could go on....