If the government would just reduce spending appropriately to reflect this 'lost' revenue, then it would not be an issue. The issue here is not that the government is letting US keep more of OUR money, but that they think they are entitled to it without responsibility. In all reality, if we could ever hold government responsible and get them spending correctly, we would all have a lot more money in our pockets.
But that is impossible, because the government feels entitled to our money. It is easy for them to take, but never to give back. Until this attitude changes, spending will always be out of control. When taxes were originally levied, they were for specific projects of tasks, now it is just assumed that the government needs the money. Worse yet, the government never shrinks itself, it is like a living, breathing, money monster.