I know several people with "minor" convictions who have travelled to the US & "winged it" on visa waivers, and got away with it. In so doing there is always the risk the authorities will find you out and turn you back at your point of entry. Only you can decide if that (and the consequent loss of your holiday with no financial redress) is worth the risk. If it isn't, you should get a visa.
Dzug. I've noticed the moral turpitude on the waivers before. What exactly does this mean? I was always led to believe you were only eligible to say 'no' to this question if you had no convictions of any sort - and had never been arrested? Confusing?