As I recall, you yourself proposed hypothesis C. Do you claim that you proposed a hypothesis without evidence, and that this was a bad thing? For that would seem to follow from your own logic.
Of course, they presumably had additional evidence regarding the truth or falsehood of B (leaving aside highly unlikely scenarios like them performing acts of which they were unaware), which other people don’t have. So the situation isn’t quite symmetrical.
(Not disagreeing with your main point. Or, in fact, engaging with it at all. Just nitpicking.)
Of course, they presumably had additional evidence regarding the truth or falsehood of B (leaving aside highly unlikely scenarios like them performing acts of which they were unaware), which other people don’t have. So the situation isn’t quite symmetrical.
(Not disagreeing with your main point. Or, in fact, engaging with it at all. Just nitpicking.)