Should bankers who caused the 2008 financial crisis also be on home arrest? Sometimes it is about punishment not rehabilitation.
Having said that, I agree 9 years seems extensive. We're just accustomed to these long prison terms. I would have thought 2-3 years plus fines, maybe 5.
The US has the largest prison population in the world both by capita and in total numbers. This is an indication that something is horribly wrong.
(very few people should have gone to prison, but Sean Quinn did for Anglo-Irish Bank, and everyone involved in the US robo-signing fiasco should have at least got a conviction and ban from positions of trust)