Exactly correct SYLVIA WYSS, when Colorado legalized CCW's, all the doom and gloom dire warnings of increased crime or unlawful shootings by those with CCW's because the firearm was on their person being carried, did not materialize at all. 
This entire piece is just another liberal fluff piece relying on 3 well noted liberal citadels of higher education as to somehow being creditable, being presented by a noted liberal publication, and sold to the liberal Denver Post to be digested as fact, when it is nothing more than a biased survey in place of facts designed to influence others, versus placing facts at people's disposal.
It's a very old tactic, and well worn as now many will site a biased survey conducted on a targeted 4000 as to being a fact concerning a nation of 350+ million people. 
Heck, C.U. fought against allowing one conservative professor on it's faculty a few years ago, as it's faculty generally speaking is entirely liberal. 
Biased surveys don't replace compiled facts.