Keep in mind that with the responses you get, the concept of something being a "fact" is interpreted by each side as information that favors their perspective. Information not favoring their perspective is said to be false, created, biased, misinterpreted, etc.
Another aspect is that both sides will take some sort of correlation, call is causation, and say it proves a point. For example, when states get concealed carry legalized, the crime rate drops.
Back in Sept 2005, I crunched some numbers after a "Gun Tests" article said NIOSH data indicate a decline in crime in states with CCW versus those without. It was very interesting. One of the things I found was that for my home state, Texas, that instituted CHL in 1996, the crime rate dropped from 1996-2000. Concealed carry must be working, right! This is actually a correlation, not a causation.
How well was Texas CHL working? From 1996-2000, with the institution of Texas CHL, it worked so well that crime fell in MA, CA, NY, and ME, the latter states not being terribly pro gun states at all. And that, my friends, demonstrates just how powerful the Texas CHL is. We do things bigger and better in Texas!
As it turned out, crime had been dropping quite a bit in the last decade or two and quite a few states got concealed carry in that time. Did the crime drop because of concealed carry or was it a correlation such as crime dropping in all those non concealed carry states when Texas got its concealed carry?
You will find that both sides conveniently leave out a lot of this sort of information. They will and do present information in a manner that will best suite their perspective. As such, the "facts" of the gun control debate are hard to call as "facts" unless you actually know where those facts came from, how they were derived, how they were massaged, and what biased were put into their presentation.