Depends on the province. Eastern bits? Yeah, they’re mostly ok. But Sumatra is as scary as almost any other Muslim region in that region… And Java (or parts thereof) sometimes breaks into periods of mass murder in the name of “the prophet”, too

I don’t know enough to know exactly *why, but as I said in another comment, I think it’s at least partly to do with pre-existing cultures on those particular islands, and how late Islam actually reached these places, etc…