I put the blame everywhere, but ultimately the rich are a target because under a Bitcoin economy redistribution of their wealth will have to be the end goal in order to reward the productivity of the working man.
If the marketplace values the work of the "working man" then it will pay him accordingly. Stealing resources from people who have harmed nobody is not okay. If you think the working man deserves more, you are welcome to hire him - indeed if he is so much more productive than his wage indicates, then you should outbid the other employer.
The idea of "redistributing wealth" becomes even more silly when you realize that wealth is produced, not distributed in the first place. What a rich person has, he earned (unless he engaged in fraud or theft), and what someone earns, he deserves to keep.
Wealth is not a pie to be sliced up evenly. It is produced, and belongs to the producer exclusively.
Hey, look, if the redistribution back to the working class that generates the productivity happens naturally then there will be no reason to take the wealth by force. So you have nothing to worry about.
I think you will find though that once we switch to Bitcoin the wealthy will already start with an advantage. Since we can't print money the wealth is naturally going to have to flow from the source where it is currently located. It's happening one way or another.