The most avid promoters of tolerance on the political left are among the most intolerant people in existence. They will not tolerate intolerance of their pet vices, and those who express any disagreement with their chosen path earn a bitter enmity you almost never see coming from any Christians other than maybe members of the Westboro Baptist Church. But in expressing their intolerance of intolerance, the promoters of tolerance demonstrate that it is impossible to have no strongly held opinions at all. The opinion that one should have no opinions remains an opinion, and the people who tell you not to preach invariably end up preaching.
This was as true two and a half thousand years ago as today.