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“Your bringing trouble,” and “bad idea,” loopily spray-painted in blue, were among the ominous messages that greeted walkers, bikers and surfers flocking to the Upper Great Highway on Sunday morning.
Overnight, the roadway-turned-park was vandalized for the second time since it closed to cars on March 14.
The fate of the highway, which has been a thoroughfare between Lake Merced and the Outer Richmond for decades, is controversial — as the tag “gentriffy,” misspelled on the pavement on Sunday morning, might suggest…