It's not so much an economic perspective as a political one, the government derives its power (and income) from the current federal reserve system, if something were to undermine this system the government would be left toothless and facing a very angry populace.
A full investigation of the banking system would cause credibility to be lost by the banks which would unravel the whole system as the fractional reserve system collapses. Thus the government needs to remove credibility from those who pose a threat to this system.
As to why white supremacists aren't targeted, white supremacists don't pose any fundamental threat to the banks or to power because their ideas are unpopular, occupy touches upon an angry thread running through the country that the average person cannot get ahead. Threads like these unseat governments, an unseated government cannot prevent an investigation into the banks.
It's not simply a political factor (although it mostly is.) This has nothing to do with the Fed (which I believe should be done away with.) The powers the USG use to go after groups that potentially threaten it existed before 1913 (even though more powers have been added since then.) The Fed has nothing to do what so ever with this discussion.
I misunderstood your comment then (my apologies for down voting it then.) My best guess is that there are probably a number of reasons why the Feds are targeting specific groups.
It could be as simple as the Occupy movement represents a target rich environment.
This doesn't explain why they keep doing it to muslims who don't care about the fed, or at least dont care about it any more than any other aspect of US culture.
I meant economic in more of a generalised "freakonomics" sense.
+1 that is a great point about the occupy movement. The level of violence against who I think are largely law-abiding protestors has surprised me. It seems like we are quickly becoming a different sort of country.
A full investigation of the banking system would cause credibility to be lost by the banks which would unravel the whole system as the fractional reserve system collapses. Thus the government needs to remove credibility from those who pose a threat to this system.
As to why white supremacists aren't targeted, white supremacists don't pose any fundamental threat to the banks or to power because their ideas are unpopular, occupy touches upon an angry thread running through the country that the average person cannot get ahead. Threads like these unseat governments, an unseated government cannot prevent an investigation into the banks.