What if both establishment Democrats and Republicans adhere to Progressivism, an ideology measures of magnitude different than liberalism or conservatism, while only fabricating a liberal or conservative identity just to win elections? It adds up. Progressivism advocates first and foremost that everything is political. All social and economic problems, no matter the size or scope, are best solved via government-driven political solutions.
Progressivism concerns itself with groups and their highest functions. Progressives consider human beings to be group components, resources for groups' highest functioning. Components of groups are tightly controlled and expendable as necessary. This is in direct opposition to the core individualism driving both classic liberalism and conservatism. Therefore, it only follows that liberal and conservative individualism is an existential threat to Progressivism and must be eradicated.