A minority of them probably do want to destroy Wall Street, but they're a minority and I think if you bring most of the Bernie supporters to the table you'd be able to hash out a more reasoned and thought out future. The fact is that a lot of them are infuriated and angry about the inequality gap but they don't know how to actually fix it. Reaching out to them with empathy instead of shutting them out with anger seems to me like a better path, and let bygones be bygones.
I don't know who is to blame for this (I suspect a mixture of groups and politicians on both sides of the aisle), but income inequality =/= Wall Street. There's an overlap there, for sure, with people who don't pay their fair share and people who earn way beyond what anyone should earn. But it is lazy and engenders ignorance to simply say "Wall Street", and expect things to happen. And using paid speeches as an anti-Wall Street argument is buying into that, and short-changes the electorate by pandering to the desire for simple answers.
Wealth redistribution (through taxes and higher minimum wage) desperately needs to happen, but we (and Bernie, and Warren, etc) cannot just keep on repeating Wall Street Bad. It is pointless, and it harms the Democratic cause.
Edit: And it should be noted that income redistribution crosses the aisle for a lot of people. The true economic anxiety Obama-Trump voters are the ones worried about their savings and their kids college funds. They don't give a shit about Wall Street, but they
do give a shit about being paid a fair wage.
_/¯