but you have to be among the worst people on earth to use your billions to be a high profile bigot.

What she is is stubborn. So when she uttered a belief that much of Twitter found offensive, they piled on her, and she dug her heels in. It's a pretty common pattern - people called out on something (even something objective) will resist, and resist in proportion to how strong the call-out is. Our brains just were not designed to handle being personally criticised, ridiculed and insulted by thousands of people at once.

You can see this if you track her statements over time: from the moment Twitter piled on, she was a lost cause.

And yes, I do partly blame those people for what she has become, even though she could change her mind - I think we have a moral duty not to join in publicly berating people so as to avoid exactly this kind of negative effect, and people failed at that.