I disagree. In fact the exact opposite is true. Look at the 4 "D"s of Physical Security:
D - Deter
D - Detect
D -Delay
D - Defeat
Notice the first one. "Deter." We put up very visible fences to deter criminals. If they get past the fence we put up highly visible CCTV cameras to observe and record their actions. If we have security persons they are visibly uniformed, and in many cases, visibly armed. We put up signs that read "These Premises Protected by CCTV" or "These Premises Protected by Armed Security Officers."
If the visible measures are successful we don't have to use the last three, which include seeing, slowing, and using deadly force.
Criminals like soft targets. By making the target as visibly hard as possible, the criminals will go down the street to the store that "doesn't want to hurt your feelings."