Comment by runako
1. Comparing a city-state to a city in a large country is kind of a silly exercise. There is no hard border at ("everything's legal in") New Jersey, for example.
2. Singapore has a very different firearm regulation regime than the US (or even New York State or NYC). Your argument could make sense as an argument in favor of more tightly restricting firearm ownership in the US.
3. Your argument doesn't even attempt to generalize to other authoritarian regimes. One could equally compare NYC's murder rate with that of Japan or Switzerland, which did not have to use authoritarianism to achieve low homicide rates.
It's not silly to compare, but it is silly to draw causal relationships. Especially when cherry-picking
Huh... maybe authoritarianism isn't sufficient to conclude the homicide rate... I mean Saint Kitts and Nevis is a constitutional monarchy and has the highest homicide rate in the world.But let's also compare Homicide and GDP[0]. There's multiple interesting things to say from graphs like this. Though I still wouldn't conclude a causation here.
People love data when it confirms what they already believe but people don't like putting in the work needed to interpret data. Granted, the latter is not easy. But maybe if we're not math lovers we probably shouldn't claim to also be data lovers.
[0] https://ourworldindata.org/grapher/homicide-rate-vs-gdp-pc?x...