Politicians, both Republicans and Democrats, decided that they love lording power over the peasants.
This is an essential truth that many do not understand. Republicans portray themselves as the party of less government but they aren't really. ALL politicians, regardless of party, will grab for more power if they have the chance, it's human nature. If you're in the business of selling cars you're not going to do something that will intentionally decrease your business. Likewise if you're in the business of government you're not going to do something to decrease your influence. Everyone thinks their job is the most important one in the world, especially politicians. Politicians are unique in that they are one of the few jobs where they can vote to increase their own pay and power, most workers can't do that.
Republicans and Democrats are essentially the same, the only difference is their sales pitches.