BY: BILL HUTCHINSON, ABC NEWS (NEW YORK) — Fortified fencing, barbed wire and concrete barricades have gone up around the courthouse and police stations in Minneapolis in preparation for the landmark murder trial of former police officer Derek Chauvin for the death of George Floyd. But what may seem like necessary preparations for unrest that could accompany the trial, in a city still recovering from the violence and destruction that erupted there last summer after Floyd's death, to others is a frustrating sign that government officials don't understand the source of tensions between police and community in the first place -- aggressive police posture.