US issues with the IRS precede Bush by decades.  the most recent fiasco was hearings in 1997 in the Senate that ended up in a bunch of sob stories, and senators from both sides of the aisle ganging up on the IRS.  Yes maybe collection methods had gotten a little harsh, but as usual the pendulum swung totally to the other side, and the IRS is underfunded and with little power to collect.  Note from your own diary

Although I.R.S. officials acknowledge that this will be much more expensive than doing it internally, they say that Congress has forced their hand by refusing to let them hire more revenue officers, who could pull in a lot of easy-to-collect money.

Not every problem in the US began with George Bush, though I admit it's fun to blame it on him.