According to the Wikipedia page for Fitchburg
>the median income for a family was $57,245. Males had a median income of $47,350 versus $37,921 for females. The per capita income for the city was $22,972. About 14.6% of families and 19.4% of the population were below the poverty line
Compare this with an area like Greenspoint in Houston, where middle class office workers are regularly warned of muggings outside their office buildings
>nearly half of Greenspoint residents have an income of under $25,000 per year, well below the Houston median of over $44,000 per year
Respectfully, while you may not have been in a pristine gated community, I think you underestimate what it means to live in a truely shitty area, and I think your advice, while reasonable on the surface, does less than you think to prevent being a target of violent crime.