no i think you need to take a look. the simple solution to everything in the world isn't "uhh tax the rich" (which isn't always rich people anyways). for all that sanders is proposing he's going to have to raise the taxes on the middle class, that's straight up inevitable.
He hasn't said the solution to everything is just "tax the rich tax the rich etc etc", he's not claiming to be the solution to all the worlds problems and ailments. He's said it can help get things started in the right direction by making sure that everyone is paying their fair share, which as of now is not happening, and then using that money to fund things that will help the middle class. He's not insane, he's going to have it budgeted so it's not going to go overboard. He wouldn't raise taxes on the middle class so he could make programs to help the middle class, that makes no sense at all.
Unless you have hard evidence that raising taxes on the rich will somehow magically raise taxes on the middle class, I really don't see your point.