Volcanoes are controlled by the airlines. They are used to disrupt flights.
…..and gouge more money out of the unsuspecting travellers who are only travelling to Bali 'cause it's cheap! "Those bloody airlines are making' us stay 'ere so they can get more cash outta us. Jungle Air had twenny flights in 'ere today an' they flew straight through the volcano smoke 'n they didn't crash - I saw 'em!"