Don't know if this is true for others but my primary issues with the coming tax increases is that I don't anticipate any advantage to ME from them. I already have health care - it was part of the reason I got a lower salary than some, I saved for my retirement (and paid lots of taxes in the process - and will pay a lot more when I cash in IRAs/401(k), I don't want any more "services" from the government, I don't want to bail out every Dick, Tom and Beatrice for their stupid mistakes, I paid my mortgage(s) on time and don't want to pay someone else's, I lived below my means so that I could have something in my old age to live on and I don't like the idea of being called "rich" because I did so, etc.
Some could argue (and will, no doubt, if not here, then in congress) that I had it good, so now it's time for me to feel some (well, actually MORE) pain at tax time. Good argument, if you're the one who will get my tax money handed to you on a platter. Not so good if you have to pay more than you used to so it CAN be handed to someone else.
Call it class envy or class warfare. It doesn't really matter. Any system that continually requires a larger share of GDP (yes, I know, it does go up and down, but the long-term trend is always up) is bound to upset those who end up paying. Since you have to have something to pay something - guess who gets to pay most of the new taxes. Those (in our case, the retirement community) who did all the "right" things (you know - like LBYM, save, do without, make do, etc. etc.). Now I strongly suspect the 50% who don't pay taxes will be trying to take even more from us who've always paid taxes.
I know there are arguments on all sides of this issue, but the OP's question was about why so many tax threads and the angrier tone. Anytime someone takes something away from you without your permission, I would say most folks DO get a bit angry about it. I'm all for charity and helping those with less than they can survive on, but I'd like to choose who I help and not have someone else choose who I must "donate" to.
I suppose tax time is one motivator to discuss these issues, but many other news items in the last year or so ("free" health-care, VAT taxes, Tim Guitner cheating on taxes, etc., etc.) might also have something to do with it. I consider this apolitical, because all politicians pander to those with their hands out. Just my opinion, of course and, of course YMMV.
But I'm not bitter!
Hey, how about those Blue Devils?