1) Deflation is seen as much worse, because inflation encourages spending over saving, which drives growth. Targeting, e.g. 0.5% risks missing and going negative.
2) Inflation reduces the true value (cost) of debt. And with $34.5 trillion of it, that’s a big incentive to keep it around.
IMO 2% is clearly too high of a target, but it’s the hamster wheel that makes everyone keep running so not surprising that government spins it too fast.