Scapegoating and conspiracy theories are just like all the other flailing people do because they and their ilk love to hear themselves talk. After a certain point the rest of us shake our heads and tune them out.
I think it's a bit more complicated than people just wanting to hear themselves talk. Often that may be the second step, where like-minded people mutually reinforce their opinion. It gives people a feeling of power, of knowledge, of superiority to believe they alone are in posession of the real truth.
But before that is a first step, that of initially starting to believe in a conspiracy theory or bogus "science". We live in a complicated world (probably always have, but awareness of it has increased with advances in communication and information flows). That world we live in often has no easy answers. Things are complicated. And sometimes bad things happen to good people for no real reason at all. Making sense of all this takes time and effort - and sometimes it is not really possible at all. That leads to insecurity; how can we feel safe if we don't know why bad things happen? But we want to feel secure and therefore we look for answers and explanations. Conspiracy theories provide those answers and explanations. Conspiracy theories add sense to a world that may often seem to lack it.
This is not to say that I agree with any conspiracy theories - in fact some might be outright dangerous because they don't just explain events of the past but also inform future decisions that are then made on the wrong basis. But I do have some sympathy for people who latch on to conspiracy theories. It's holding on to them too strongly, almost religiously, I have a bit of a problem with.