Most Americans use credit cards rather than debit cards for their regular spending, and the additional protections of a credit card is a big reason why. They're treated differently under American law.
The idea is that if someone steals your debit card and buys a bunch of stuff, they've stolen your money, but if someone steals your credit card and buys a bunch of stuff, they've stolen the bank's money, and the bank is on the hook for it - not you.
IIRC with debit card fraud you've got like 60 days and the bank can put some of the burden of proof on you, but for a credit card you can literally just say "I didn't buy that" 5 months later and the bank basically has to give you your money back. If you abuse this, the worst thing that can happen is the bank closes your card and cancels their relationship with you, but you won't be on the hook for the spending itself. Because of this additional liability, U.S. banks got really good at early detection of fraud and irregular spending, and Americans don't really give a huge shit about keeping their credit cards safe because there aren't really any major consequences.
