Today is the 20th anniversary of the ATF’s attack on the Branch Davidians outside Waco, Texas. National Guard helicopters played a key role in the initial attack; 51 days later, Army tanks would lead the final assault. I thought Waco might be the most important public education lesson of the 1990s, but I don’t see the learning curve yet. Most Americans forgot or never undertstood Waco, paving the way for politicians to commit other grave abuses in the following years.