Hi Oggie Doggie,
I think I speak for everyone here when I say that this thread is meant as a general travel warning, not to scare people.
Bad things happen everywhere. A relative of mine had all her jewellery stolen in Italy. I heard about someone being mugged and seriously injured in China. I'm sure other people could report bad things about lots of other places, including Bali.
These card scams (as well as phishing and other types of computer fraud) happen just about everywhere. These card gangs operate internationally so you can stay at home and have it happen too.

I believe it's a matter of doing all you can to protect yourself and if you wouldn't do a particular thing at home, don't do it while away. If something bad happens, you'll know you took all precautions but you were just unlucky.
Remember how we were all feeling just after the planes hit the twin towers??? people were cancelling flights and everyone I knew worried about me going overseas at the time and urged me to stay in Australia.
If I'd taken their advice I would never have had all the terrific experiences I've had through travelling to many countries.

If you live your life in fear and trepidation, always worrying about "what ifs" you'll never do anything.
Go for it and enjoy - just take normal precautions.