Most of the crime in St Louis is in the areas where you'd truly need an armored tank to emerge safely from the neighborhoods. The metro area outside the city itself is generally safe.
It's a shame because St Louis has so many beautiful attractions, from the Zoo to the Art Museum to the Missouri Botanical Garden, one of the tops in the US. Then there's the Arch, which is worth seeing.
Ask SR, he can tell you about his hometown, Bayonne, New Jersey, near that lovely Newark.