IRS-approved answer
Why do we pay taxes? Our tax money goes to government-funded programs (taxpayer-funded, really) to help others escape from certain ailments not experienced by the more well-off. Oh, and to avoid imprisonment. The IRS knows how much you make and how much you owe the government. If you don’t pay enough or at all, you’re getting a one-way ticket to jail.
Evading taxes has to be one of the weirdest crimes ever. However, it doesn’t help that the “free” online services aren’t exactly costless, unless you know where to look. Hasan Minaj did an excellent piece on how to utilize free tax services that you should definitely check out (RIP The Patriot act with Hasan Minaj).