You're simply revealing that you're a simple minded fool.....
"news articles from decades prior to the assassination that confirm that the rings were related to fire safety."
My dear little simpleton....Please explain how all of the red rings in the TSBD windows could have done anything but confuse the firemen who might have responded to a fire alarm at the TSBD.....
If you accept that the Dallas fire department used red rings on buildings for a fire safety purpose, then maybe the better question is wouldn't the use of such rings on buildings that already had red rings be a bit confusing to your conspirators? How would they know, for example, if they were there for fire purposes or as a "signal"? LOL. Keep them coming though. That is comedy gold.
I'll even add some suggested dialogue for your fiction writing:
LBJ: "Now Lady Bird if you see them yonder red rings, get down cause there gonna be some shootin' in the Big D. Hee Haw!"