When Gareth Groves brought home his massive new Hummer, he knew his environmentally friendly neighbors disapproved. But he didn't expect what happened next. The sport utility vehicle was parked for five days on the street before two masked men smashed the windows, slashed the tires and scratched into the body: "FOR THE ENVIRON." "The thought of somebody vandalizing it never crossed my mind," said Gareth Groves, who lives near American University in Northwest Washington. "I've kind of been in shock." Police said they see small acts of vandalism in the area from time to time, but they have not seen...