The Bush Tax cuts are the major contributory cause and continued driver of our deficit (why the left was angry at Obama for continuing them for 2 years during the recession, but the economists wanted him to)
The ten years of the Bush Tax cuts were an unfinanced giveaway to the wealthiest Americans, who benefited the most with the largest percentage cuts. The middle class portion was tiny and unsubstantial, a bone to be thrown.
If the deficit is the "most important thing" to you, you have to be in favor of letting the cuts expire.
At this point, as the economy is so stagnant, it makes sense to continue them for middle class and below, as it will keep a bit of money flowing into the economy (the wealthy don't increase their spending with more cash flow, they just sock it away)
Bush Tax Cuts were a sweet deal for the wealthiest Americans, who benefited the most:
