I have no idea what the majority is composed of and this isn’t the sort of thing that gets decided like that.When the odds reach in the IDI's favor (majority thinking as you do) you can still rudely call it nonsense, but not before. The majority isn't comprised of IDI. Just a handful of people who spin and twist whatever the subject is to squeexe into their own agenda.
Do you believe the Ramseys thought they would be taken away from the house and questioned by the police, or that the police would set up camp there in their home?
Assuming RDI, yes, I think that the Ramseys should have believed that they would be taken away from the house and questioned by the police AFTER the body was discovered. Yes, I think they should have realized regardless of involvement that the police would set up camp in their home.