the government simply cannot guarantee any level of spending going out.

Also true.

Untrue, actually. The government, at any time, can stop spending.

The government is absolutely able to adjust its revenues to what goes out.

Also true.

Untrue, actually. As I noted:

"There is significant difficulty in guaranteeing that setting a tax rate will result in those subject to it acting in predictable ways."

If you're trying to make some point about how government controls spending, but not revenue, you're not doing a very poor job of it.

Only because you're simply saying things that aren't true.