If you can accept that questioning or having doubts about the McCann's story does not equal abuse of the McCanns then I can accept that.
No I'm sorry I can't accept that, because you and I know that this "questioning" and "having doubts" (which sounds all innocent and wide-eyed when described in those terms) amounts to a lot more than just "questioning" and "having doubts". It's almost invariably accompanied by a combination of at least one of the following: snide, insulting written observations, "satirical" pictures, abusive forum names and avatars, out-right libellous accusation, myths and lies, snooping and prying into the family's personal affairs, campaigning against them by writing letters, spamming newspaper articles, actively seeking out new people to "convert" to the sceptic cause etc. By all means have your doubts and your questions, but when it crosses the line is when it is accompanied by any of the above behaviour. Then it becomes abuse of the parents of a missing child, which is not acceptable in any decent civilised society, in my opinion.