Majority of the Federal government expenditure goes into Military/Social Security/Medicare. All of which can be substantially reduced. These three components cover more than 70% of total Federal spending.
Out of this Medicare can be seen as taxing current generation to pay for the older generation. Almost all debt can be seen as taxation on future generation.
Also, I totally don't understand "public schools" arguments. Public schools in USA are the worst government institutions ever. Not only I paid taxes for this rubbish but now I have to send my kids to private schools paying full fees because the local public school is not differential from a mental hospital.