There appears to be a perpetual pattern in which people who start as idealists when fighting for change actually change to something else once they attain power. Some are simply power hungry and are good students of Machiavelli’s Prince or Kautilya’s Athashastra on how to acquire and keep power. To Kautilya and Machiavelli, who lived over 1,100 years apart, grabbing and maintaining power precedes issues of morality.
What distinguishes idealists from the power hungry is their willingness to suffer for those ideals. The power hungry, in contrast, make other people suffer for them to get or keep power. Revolutionaries generally tend to be idealists at the beginning and then deteriorate into believing that they are so right that everyone else is wrong. They then kill people while searching for ‘counter revolutionaries’. It was the case in the French Revolution which ended with the Jacobin terrorism trying to force conformity on everyone.