No, sorry, you absolutely cannot. Yes, you are correct, the BG is there to carry out a 'mission'. He/she is most likely not there SPECIFICALLY to kill LEOs, but they would stand in their way. And if he/she is a determined individual to carry out his mission like the Kirkwood shooter, and has the slightest hint of observation skills, he/she will more than likely observer the holstered firearm and kill that individual first. After all, that armed person, LEO or otherwise, poses a threat to the individuals mission. Now, does the uniform make the LEO a walking target, more so than the civilian OCing a firearm? Sure, but that in no way makes it absolutely certain that an open carrier will go unnoticed and thus not a bigger target than someone CCing (or not carrying at all).Yes, absolutely. The BG is there to carryout his/her mission. Now, if his/her mission is to attack open carriers, then they will be the target. But, like stated above what does an open carrier look like? An open carrier is easy to spot. It is that tall short fat skinny guy, you know, the bald guy with a full head of hair, the one with two eyes, a mouth and nose. That's the guy.
That's not to say it isn't possible (or likely, even) that the 'softcore' 'amateurs', the kind that really, actually don't want a confrontation with anyone else - they just want to smash/scare, grab and run - will notice the LEO (and 'abort mission') but miss the OCer in another situation and continue on, or they might see the OCer and 'abort mission' there as well - there really is no way to tell for sure. Again, these are the 'softcore' criminals, not the ones determined to complete their mission and kill others.
So stop fooling yourself into thinking that OCing in no way raises your target profile. It certainly does not raise it to the level of a LEOs uniform, but it will bring it up a notch or two because that OCd firearm, if/when noticed, shows the perp that you are capable of stopping them from preventing their 'mission'.
The lack of any data doesn't prove anything. Throughout a decent portion of the country, especially where the higher crime rates are (Think NYC and Chicago, for example), Open Carry is heavily restricted or banned, so the only individuals that would be OCing are LEOs - If your not a Uniform or a Detective/LT/etc with a badge on your belt, you'll likely be getting a ride to the station in cuffs. Add to that the 'social stigma' spewed by the lamestream media and today's snowflakes, plus the risk of physical attack by bat***t crazy liberals, the risk of being stopped/detained (unlawfully) because some loon mad a MWAG call (not everyone has nothing to do an all day to do it and really doesn't care if they need to educate some loon), etc, outside of respectable rural areas, OC is just not that common. So there will be virtually no data on the subject to really prove anything.