Roosevelt trod a tightrope between radical reformers and trust kings. He had a clever way of delivering sharp, sudden blows against business, then following with conciliatory speeches. By nature, he was a political hybrid: Strident reformers brought out his conservatism while stand-pat businessmen brought out his crusading zeal.
Much like Franklin Roosevelt in the 1930s, he introduced regulation in order to save the country from social unrest and forestall more extreme measures. He was accused of appropriating the policies of William Jennings Bryan, much as Franklin Roosevelt was later said to have undercut his left-wing critics by appropriating many of their policies.
Titan: The Life of John D. Rockefeller – Ron Chernow