People who criticise another person for an act which is contentious is not going to produce a drop in market share.
Perhaps even this is not obvious enough for you. You're probably being deliberate obtuse though. The simple point is that you can't infer a technical ability from their belief on whether gay marriage is right or not.
In addition, even if these people were proven to be bad at their jobs, I doubt that would cause the drop in market share either. Three people who are not at the very top of the company are unlikely to have that effect.