It's as daft as suggesting sceptics are afraid of the McCanns because they start so many threads trying to discredit their story. It is pure opinion, to which you are all entitled but don't please dress it up as fact, or excuse the lack of "IMOs" that this forum sets such great store by.
As far as I have seen the supporters have a limited choice of things to discredit and very little to point to abduction. The sceptics on the other had appear to have a wider choice of things to discuss and possibly as you say "discredit".
Remember one poster on here has directly accused Martin Grime of not being honest. The post may be gone but the intention was there. I have also seen other posters particularly a couple on twitter calling Martin Grime a "liar".
I stand by what I said although perhaps I wouldn't have said "afraid" I would say that supporters are keen to discredit the dogs because they point away from their approved abduction scenario.
With this in mind though why can't supporters see there is a possibility that the abductor accidentally may have killed Madeleine then decided to remove the body so they wouldn't be found guilty for murder. That is a possibility however remote IMO.