To elaborate on Ris' point you absolutely failed to draw the correlation between gun control and the extermination of a nations own people.
The are other, much stronger, correlations that can be made with your examples:
all examples cited were of totalitarian dictatorships. Many other 'rights' were also curtailed -- including freedom to gather, freedom of speech, freedom of the press, freedom to critisize the goverment.
These types of atrocities happened in other countries as well: Chile in the early 70s, Iraq's extermination of the kurds in the 90s to name just two.
A strong correlative argument can be made, therefore, for the direct link between Fascism and the extermination of a nation's own people (or a subset thereof). In fact you would be hard-pressed to cite a totalitarian dictatorship where such atrocities did not occur.
On the other hand, you utterly failed to make the correlation between gun control and those atrocities by conveniently ignoring the fact that in the second-half of the 20th century (and the first 2 years of the 21st) the following countries have instituted gun control:
Japan, Singapore, Taiwan, Kuwait, Great Britain, Netherlands, Spain, Germany, Italy, Sweden, Denmark, New Zealand, Australia, Belgium, Canada, Norway, Austria, France, Switzerland, and Finland
and you will be unable to cite any examples of similar atrocities in any of the above-mentioned countries.