First, the military, the police and the courts literally provide no value. (And don't tell me, "I bet you wouldn't say that to a soldier" because I am a veteran.) What they do is prevent destructive behavior through greater destruction. It's necessary for a free society to exist, but you and I aren't better off because someone else is wasting away in jail, we'd be better off if they had never committed the crime. Wars do *not* generate wealth, that's the Broken Window Fallacy.
So, which 98% of the government would you scrap?
Ah, the faux-Libertarian argument.
66% of the spending (Table 11.1) is not roads military and police, it is transferring wealth, literally writing checks to individuals. People think that politicians are bought, but really, politicians have been buying voters over the years.
Now while that has grown (as a % of GDP) from 2% to 66% over the years, and look at table 15.1 from the same. Government receipts have stayed steady as a % of GDP; even when the nation was united in WWII we were not able to significantly increase receipts to cover our spending.
The reality is that we have a crisis of spending too much. Our interest payments are continuing to increase, and if we fully lose our AAA rating, our government will stop providing all the services you value so much. We will spend all our money on interest payments, instead.
So if you believe in an active government that will continue to provide services, you should support efforts to balance the budget by cutting these programs.