Point 1 - and it's a big one - The PJ's summary report left no-one in any doubt as to what the investigating force thought and even though the archiving summary reported there was not enough evidence of the McCanns having committed a crime to continue to constitute them arguidos it did quite clearly state that the McCanns and their friends failed to cooperate and did not effectively "eliminate themselves from the enquiry". Furthermore it did not say that the PJ report that preceeded the archiving report was wrong, it merely archived the case and explained why.
Bearing point 1 in mind, while there is no clear evidence of either of the two binary possibilities (abduction or death & cover up) then either possibility is equally as likely (being kind to the McCanns really there). This means it is theoretically possible that they ARE involved in what the investigating force thought - death and a cover up. All the time that condition is true, the McCanns are absolutely, 100% fair game to be questioned.
You have highlighted a number of actions taken by a hard-core (and quite possibly lunatic) minority which are utterly unreasonable (stalking, threats) and some actions that are perfectly reasonable (leafleting - ONLY IF ACCURATE TO THE FACTS, questioning on the fund usage, questioning on their stories, questioning on their actions).
The McCanns have no divine right to have their version of events go unquestioned. They do have a personal right to privacy and I condemn all those that flout that right. However you and most of your fellow pros mistake the [ censored word] sticking up for themselves as personal attacks on the McCanns. If you're going to tar every single person that doesn't subscribe to "the truth according to St.s Gerry & Kate" as a <word I won't use beginning with h> and lump them in via guilt by association with those utter morons that do unreasonable things then you deserve all the abuse you're going to get.
I've said for years that the biggest failing of the Pro brigade is to realise and understand that they're not just dealing with a small hard core band of nutters and that, quite honestly, the number of sceptics at least matches the number of believers and that only very few of them are the lunatics that you seem to think we all are. You are massively underestimating the strength and depth of suspicion there is towards the McCanns in the UK and immediately go into denial about this whenever it's brought up.