Fair point. As the responses note, the damage here is usually limited -- ATMs carry only so much cash each, and (usually) only dispense up to a few hundred dollars (or equivalents) at a time. There've been some exceptions where an exploit is found and utilized in mass effect at many locations in a short period. That takes a high level of organization though.

The total amount of cash and the per-withdrawal limits in an ATM limits the loss there. You can't steal millions of dollars from an ATM.