If you leave your concealed piece concealed, you don't have to worry about it.... If you NEED to pull a concealed weapon, putting it away is a risk you must take, but pulling one to:
Show it off
Compare its size
Ask a question
Show off that you are "packin"
etc
(take your pick) is NOT worth the risk of handling a firearm in public.
Now I know a lot are going to come down on me with "he is a cop blah blah blah" but a police chief carrying concealed has no more need to pull his gun than a citizen carrying concealed. If he had left it alone, none of this would have happened.... (And I bet his officers would earn a reprimand for the same negligent discharge).
This brings us to where all of us are vulnerable.... the more we handle firearms, the more we can take them for granted.... I know our police officers are desensitized after years of handling firearms (the majority of which are completely safe). We all can fall in to this trap, and all must use due diligence to prevent these things.
YMMV, but I think handling a CCW without need is nuts.....