E.J. Dionne in the WaPo sums it up nicely.
The key to corruption is operating in the dark. This bill is a mess of opaque provisions that almost no one outside the ranks of tax lobbyists understands — because many of these giveaways were written or inspired by lobbyists themselves.Needlessly rushing a massive special-interest tax bill through Congress is the antithesis of good government. This doesn’t seem to matter anymore, even to Republicans who built reputations as champions of moderation, openness and rectitude.