There is nothing ridiculous a out what I have posted. Try more understanding and less ridiculing. The morning after Madeleine's disappearance the twins were awake and functioning normally. No immediate danger to them. Their sister however was still missing and this was the McCanns' primary concern. In their opinion all their children may have been sedated by an abductor and so they raised this concern with the police as it may have been an important factor in the disapparance. Which bit of this do you find especially ridiculous?
The time to act was not in the morning when they could see the twins were fine but on the night of the third when they were totally unresponsive. They were damn lucky their children didn't suffer any long term effects. If they had acted in the same way when doing their job they would have been struck off.
As to raising their concerns about the twins unresponsive state a couple of days before, they didn't. They asked whether anything pointed to a sedative being used in their daughter's disappearance. They made no mention of the twins, suspicious I'm sure you'll agree, in the circumstances. They asked for no test even though you claim they mentioned sedation to the FLOs in case it was an important factor in the disappearance. Wouldn't finding out what was administered and how it was administered be helpful to the enquiry?