Insiders sell for a variety of reasons. It's not always because the company is in trouble. If the numbers being reported by the company were positive and there was no reason to be concerned about the health of the company. A series of well timed and spaced insider sales wouldn't generate much suspicion strictly on their own.
A series of well timed and spaced insider sales wouldn't generate much suspicion strictly on their own. I realize that insider trading (properly reported) is not uncommon. Press reports, however, make it sound like nobody knew that these insiders were selling. Check the link I posted above. The page is a long download but it shows that the selling went on all year long and was being reported.