Terrorism has already marred two Olympic games. Will it affect a third? Unfortunately, even with perspicacious law enforcement, that’s looking increasingly likely. At the very least, officials in France say that they’ve headed off one terror plot before it got to the critical stage: on Friday, The Associated Press reported, an 18-year-old was charged with planning to target spectators at the soccer tournament at this year’s Summer Olympics in Paris, which open on July 26. The man, unnamed by authorities, was supposedly looking to carry out a “violent action” on behalf of the Islamic State grou…