Facile statements that Muslim terrorists will bomb Coz if they cannot kill infidels in Bali are not particularly helpful.
The fact of the matter is that the Balinese have the extreme misfortune to be infidels surrounded by the most populous Muslim country in the world. They are infidels every bit as much as the Western tourists who visit. Because Indonesia's political system is so dysfunctional, and because the Javanese who run it have little desire to crack down on the co-religionist terrorists in their midst, Bali and all who travel there will continue to be under threat of violent attack.
And it isn't like it has just been the two bombings. They were the most high profile incidents, of course, but other sectarian violence has been occuring.
Frankly, I think it is a major, major mistake to travel anywhere in Indonesia at this time.