Nothing you've said suggests the fact Stamford has the lowest violent crime per capita is a "myth." You have discovered the concept of geography and population centers — concepts that exist everywhere else too — but they don't impact the data.

On average, in general, Stamford is safer than other cities in New England with a population above 100k. In fact, it is the safest. This does not mean crime doesn't exist. It means if you're looking to buy a house, Stamford is very attractive compared to alternatives (NYC, Bridgeport, New Haven, Norwalk).