The government uses your taxes to … encourage you to pay your taxes. According to Forbes:
The federal government spent $152 million over a 30-month period to cajole Americans into paying their taxes, taking their medicine and staying in school. Agencies involved in public service announcements insist it is money well spent.
A $40 million radio campaign to encourage volunteerism on public lands, $24 million campaign on the new color of money, and $37 million for Defense Department ads. The rest of the article is well worth reading.