While the discussion about energy policy (and the lack thereof) is interesting, it really has little to do with this specific discussion. What you have are private sector groups on the opposite sides of the argument lobbying government to get their way. The EPA is somewhat stuck in the middle.
E15 is NOT an EPA mandate. Never has been. It started in 2009 when an ethanol promoting industry group petitioned the EPA to allow a waiver to the current rules so they could sell E15. The EPA granted a partial waiver. Should they have? They were screwed regardless. If they didn't they would have been accused of blocking the free market. Instead they are being accused of forcing the use of ethanol.
If you want to bitch about the push for ethanol you need to direct your attention to this group: http://growthenergy.org/
That is the ethanol industry group that is promoting the use of ethanol and the ones who asked the EPA for waivers.
See http://www.epa.gov/otaq/regs/fuels/additive/e15/ for details on this subject.