An argument oft made against zoning is it is fragile. Planners cry it is essential to protect property rights, but once it is in place, influential people can always unprotect anything. A code change in downtown Hendersonville recently allowed microbrew pubs. Now, people who thought they were protected are afraid. Zoning advocates, however, are telling them the bars attract professional clientele. The one in question will even be vegan and animal conscious in other ways.