This is a vague generalization with zero statistical basis. I suppose that conducting a poll on this forum, you probably find most believe RDI. However the 'not many seem to actually believe IDI' is incorrect as far as those closest to the investigation. Your generalization is not valid with respect to those who are important to the case, those who are informed, those who matter most.
I guess who matters most is a subjective thing.
I would say who matters most are the people with genuine love for JonBenet, those who actually want her killer/s brought to justice. There are systems/agencies that have more vested interest in that NOT happening.
Those who did NOT consider JonBenet sport for either the depraved or mentally ill, who did NOT consider JonBenet a manipulative tool, who did NOT consider JonBenet a sexually-arousing plaything, who did NOT consider JonBenet as merely another child sent back to dust and ashes so that more and more and more little girls could continually take her place in someone's sick twisted mind, THOSE are the people who REALLY MATTER.
The people who want this killer and this crime brought to light of day so it can be understood and so it might never be perpetrated on any other little girl ever ever again, THOSE are the people who matter.
Everyone else can shuffle papers and draw paychecks all they want; I don't care. Over the long period of time, it has become VERY APPARENT who really WANTS this crime solved. Those who don't, shut up and move to the back of the bus. Your oxygen supply is about to run out.