Well, I've been with the same credit union since I was about 12 years old. My spouse has been with them since she was 19. That's 50 years for me and 42 years for her. We've had a debit card (and a credit card) with them since debit cards were available. They have notified us of unauthorized purchases on our debit cards several times over the past decade, closed our card, and got us a new one the next day at least three times that I can remember. I recall one occasion where money was spent in Canada and Georgia on the same day at clothing stores, and they found that suspicious, so blocked the account and notified us.
When we travel, they notify us of gas purchases out of state. The last one was a few months ago, when I filled up my Suburban here in Indiana (30 gallons), 6 hours later in St. Louis (30more gallons) and 6 hours after that in Oklahoma (another 25 gallons). They saw $350+ in activity in 3 states within 12 hours, flagged it as suspicious, and shut off the card. We called them, verified the purchases, the opened the card, and off we go.
I pass my debit card at every drive through window, gas station, grocery store, bar, restaurant, retail outlet, you name it. I've had the same $50 in my wallet for about 6 months. I like to have some cash when we travel, and the debit card is also our ATM card, so I make a cash withdrawal before we head out of town.
Not once have we ever lost a penny on our debit card. If you have a reputable financial institution, those fears are unfounded.
As for tattoos on their knuckles, well, that really doesn't mean anything anymore.