Should the Democrats give up on demanding Trump's tax returns and why do they matter?

I think they’re just nosy. Like children wanting to get even with little Johnny down the block by proving he took pennies from mommy’s wallet. Pelosi, give it up. She’s starting to be quite a bore. A crazy one, maybe, and a hypocrit with a wall around her property.
I’m proud to say I don’t care one bit what’s in his returns. And I’m not alone in this either.