I don't know that your staunch defense of anger will go over very well in terms of rational debate. Anger can be natural but only humans have the power of mind to know when to express it and when not.
In among the reasons of 'why they are angry' is the outrage at the profligate spending, which, when it is publicly exposed as it was during the government's response to its self-generated crisis of meddling, results in exactly that kind of political response.
Look at Social Security for example. This is what made 'hidden' borrowing and thus, subsidized extra spending via the abuse of the poorly named SS Trust Funds so insidious. I think some people who are members of the Tea Party understand this issue, but few people in general understood the accounting, even today, even as Clark put it in black and white 30 years ago and got 1% of the vote. The argument 'we were going to borrow the money anyway' is a total non-starter, exactly because of the evidence of the current outrage at disclosed spending. That full argument is 'we wanted to spend more than the electorate would politically tolerate, so we cooked up a way to hide the additional borrowing by taking it 'off budget.'
Few understand the real 'double whammy' impact of this scheme. Not only is a demographic surplus subsidy turning over into a demographic deficit drain, on an easily predicted actuarial basis, but the 'hidden subsidy borrowing' of that once surplus, when it is gone, is not really 'gone.' It leaves behind a hole in the budget, once paid for by the hidden surplus subsidy(which was justified as being required to exactly 'pre-pay' for this coming rainy day!) Revenues must increase or spending must be cut not only to pay for the added benefits drain, but to account for the hole left in the budget by the loss of subsidy.
Said another way, what felt so good on the way up -- the current spending bonanza paid for by borrowing from the future instead of saving for the future -- is going to feel doubly bad on the way down. Not only has the government mismanaged the SS program and not adequately accounted for an easily predicted coming rainy day, but their policy has actually made the coming rainy day worse than it would it have been(as it must, because it made former sunny days better than they would have been, via subsidy from the future.)
The government 'pre-paid', via extra taxation on an already surplus paying demographic, precisely nothing. Instead, they simply borrowed and spent even faster, heaping more debt on the future that is now here.
Total insanity.
If/when much of America realizes what these total idiots did to the nation(and continue to do to the nation), it will be as Moynihan once admitted on the floor of the Senate, decades ago, paraphrased from memory: 'God help us when the nation realizes what we've done.'
The Tea Party Movement is the nation beginning to realize that the CronyFest on the Potomac is and has been totally out of all control.