We're always going to gonna have differing opinions of what areas within a big city is considered safe and what areas are dangerous. Some of it is due to upbringing, age, sex, street-wise rating...etct...etc. Younger folks tend to <ahem> have more courage and will frequent trendy clubs in questionable parts of town. Also, we're always going to have some who are home bodies and others who will always point to situational awareness as a crutch to stay out of harms way.
The bottom-line is that situational awareness only gets a person only so far. One can avoid the bad parts of town and stick to the tourist areas, however, may one be reminded of the various attacks in well known areas of big cities over the summer along with the countless crime victims who were completely aware yet fell victim to the BG.
When the do-do hits the fan, nothing gives me a warm feeling all over than a firearm with extra ammo.
"You haven't lived until you've died." - various