SOUTHLAKE — Tips keep pouring into Southlake police after releasing the now-infamous video of a gray-haired man using a key to vandalize a Hummer. The crime was captured on the vehicle's own surveillance system, which had been installed because it had previously been defaced in a similar way. There have been no arrests yet, but there is legitimate speculation that this could be a case of suburban eco-terrorism against a certain gas-guzzling SUV. Police say they don't yet know the identity of the man videotaped using his key to gouge "X" marks into the side of a Hummer. But the...