Why should Trump spare Iran's 'Orphan Pearl' island amid attacks on the mainland?

US forces bombed Iran's Kharg Island, often called 'Orphan Pearl', as part of their attack on Iran. The island's destruction could trigger catastrophic global and regional consequences, likely pushing crude oil prices above $150/barrel. This is because the island handles nearly all of Iran's oil exports, and its destruction may wipe out two million barrels/day from the global supply chain.