Scientists agree: guns make society less safe

[True Federalist (진정한 연방 주의자)]

Now that scientists agree that guns are bad, Republicans will be for them.

[True Federalist (진정한 연방 주의자)]

The number of guns in the US has increased drastically in 20 years. The rates of violent crime have decreased drastically in 20 years.

Are these "scientists" just political scientists? They clearly aren't using any data.

Rates of violent crime have been declining heavily all over the developed world, regardless of the number of guns. Also, while the number of guns has gone up, the level of gun ownership has been going down. Gun sales have risen due to paranoid buyers getting multiple guns.

[True Federalist (진정한 연방 주의자)]

The suggestion that guns are never used to prevent crime is blatantly false:

Taking data from two different sources with completely different methods of obtaining their data is inherently unreliable, especially when one has a bias towards undercounting and the other towards overcounting and moreover they don't compare incidents of equivalent severity.  In short, the comparison you make relies upon junk statistics of the sort only a university social sciences professor could love.

[True Federalist (진정한 연방 주의자)]

I'm curious as to why you think that the Bureau of Justice Statistics is biased towards undercounting (I'm not saying that it isn't, just wondering why you think it is).

Incidents reported to the police are but a subset of the ones that actually happen, especially when the victim thinks there is nothing to be gained from making a report.  While the NCVS does have an advantage over police reports in that it reaches out to survey people, even then people are likely to avoid mentioning incidents simply to avoid the hassle of being stuck in a lengthy poll.

Conversely, the other set includes incidents in which people think they stopped something when there wasn't anything that happened, plus ones that were resolved while having a gun that could have been resolved even without a gun being involved, so it overstates the usefulness of DGU.