ISLE OF PALMS, S.C. — From the water, the private sea wall in Rom Reddy’s backyard looks like a concrete fortress guarding his mansion in Isle of Palms, South Carolina, a wealthy beachfront community east of Charleston. A sign on it reads: “No trespassing. Private property.” Since 2023, he has been in a legal battle with South Carolina’s primary environmental agency and various other environmental organizations that say the wall is worsening erosion and breaking a long-standing law that has protected the state’s sapphire coastline, one of its major economic engines. Now, instead of fighting the state, Reddy is hoping to run it. The former Exxon and artificial turf executive has funneled his frustrations into a self-funded, longshot campaign for South Carolina governor, pitching himself as a Trump-like outsider who seeks to dismantle a bureaucratic system that ruins lives.…