And somehow they arrived at different answer?
Sure, why not? As TFA illustrates, sometimes the losses that banks are incurring differs between the US and Europe. No one has (so far) started blowing up ATMs in the US, so why would the banks spend money making them explosion-resistant? Similarly, if the cards aren't being counterfeited at a rate deemed unacceptable by the banks, why should they upgrade all of their ATMs?
As an aside, the big American credit card companies (not the ATM cards) are switching to chip cards. After 2015, if you are a merchant and don't upgrade to a chip reader, you will have to accept responsibility for any fraud. The transition is estimated to cost around $8 billion, so there is pushback from the merchants and it will be interesting to watch it all play out.