Tipping culture alone shows how backwards the U.S is

Nothing wrong with tipping. But to have it expected? Where is the logic? How on earth is not giving money away frowned upon? Are Americans stupid? You pay the price listed for whatever service you are paying for. Is this not Economics 101? Set a price and the customer pays it?? It actually infuriates me, if someone can come up with a genuine reason why it's my responsibility in America to tip underpaid workers, and why this hasn't just been rectified with local laws to protect employees, then ill shit in my hands and clap.