Tell him:

“Well buddy, we pay taxes because if we don’t, the government gets mad.

They say it’s to fund roads, schools, and hospitals, and sometimes it is, but yeah, they also print money, run deficits, and spend on wars we never asked for.

It’s not fair. That’s why your daddy is smart and it is using and saving in Bitcoin. The government can’t take it away from me, and nobody else can. To stay out of jail, I pay the bare minimum of taxes. But the day will come when I’ll pay no taxes. Daddy knows what he’s doing.”