Ah, but despite logical complaints, the characters in Ocean's 11 were indeed presented as heroes, and not anti-heroes. The plotting and characterization of the movie produced empathy for the characters, and a desire for them to succeed. While they did illegal things, their actions were presented in the 'loveable rogue' vein. We aren't supposed to think 'these are ruthless men who would kill dozens of people to get what they want' we're supposed to think 'aw, look at all those nice people who are stealing from the big bad gambling-kingpin.' In fact, I think that the characters presented--if confronted with factual knowledge that they were going to kill people with their little electricity thing--would probably have found another way. As it stands, it's just an example of 'don't think too hard about this' plotting.
Of course, despite being a great movie, it was rife with that kind of plotting sloppiness. I mean, what was the point of carving up explosives like gemstones and going through all of the trouble of sending them down in a briefcase when you have a guy sneaking into the vault in one of the money bins? Couldn't he have just taken the explosives with him. . . .