Because Icelandair operate a 'hub and spoke' operation which is an efficient way of operating a small airline. The aircraft all leave their destinations on the 'spokes' to arrive at the 'hub' at a similar time. Everyone disembarks, swaps planes, and flys out on the spokes to new destinations.
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Iceland's customs laws prevent you from bringing certain items into the country in order to protect Iceland and its environment, including narcotics and dangerous drugs, uncooked meat and various meat productions, uncooked milk and eggs, various weapons, finely powdered snuff and moist snuff to be used orally.