Every person that has ever ran for president was, at heart, an authoritarian. Authoritarianism is embedded into the very core of their being. This may be an uncomfortable truth to bear, because so many people want to believe those running for office have their best interests at heart, but it is a truism that must be acknowledged.
"It is not in the nature of politics that the best men should be elected. The best men do not want to govern their fellowmen." - George MacDonald
From Jeremy Corbyn to Hillary Clinton to Bernie Sanders, all presidential candidates are in the business of acquiring political power to further THEIR own agendas, not yours. Their goal is to GOVERN and CONTROL the lives of their fellowmen, to enforce THEIR will upon millions of others. They want to decide how much money you can earn, tell you who you can and can not do business with and decide what substances you can and can not ingest. God forbid you were to decide those things for yourself, like a responsible, mature adult. No, THEY will decide for you, because THEY know what's best.
There is no such thing as a good politician. There never has been, and never will be.
You are absolutely right, but have you ever thought of WHAT is wrong with people who desire power over others?