I agree that I'm being a little silly, it's what my last line hinted at! I do think outrage is better directed at our legislators than at corporations though, but I don't hold out hope for substantive change either way.
I don't think outrage is better directed at legislators until there is some consensus on what would be changes to the tax code that would help alleviate this problem. I think we're a couple of steps from that and I see no reason why we shouldn't get angry at the large companies until they help us with that step. After all: they are the experts on loopholes and tax evasion!
Journalists already do try and explain the failures of the tax system. For example, check out this graphic: http://www.nytimes.com/interactive/2012/04/28/business/Doubl...
The tax code is complicated and boring and people would much rather read articles with outrage directed specifically at companies.
Should I say that you're silly for getting angry at journalists for following their incentives rationally?